Brief overview of all of Neomutt's Configuration variables.
| Global Variable | Config Item | Description |
|---|---|---|
| C_AbortBackspace | $abort_backspace | Hitting backspace against an empty prompt aborts the prompt |
| C_AbortKey | $abort_key | String representation of key to abort prompts |
| C_AllowAnsi | $allow_ansi | Allow ANSI colour codes in rich text messages |
| C_ArrowCursor | $arrow_cursor | Use an arrow '->' instead of highlighting in the index |
| C_ArrowString | $arrow_string | Use an custom string for arrow_cursor |
| C_AsciiChars | $ascii_chars | Use plain ASCII characters, when drawing email threads |
| C_Askbcc | $askbcc | Ask the user for the blind-carbon-copy recipients |
| C_Askcc | $askcc | Ask the user for the carbon-copy recipients |
| C_AssumedCharset | $assumed_charset | If a message is missing a character set, assume this character set |
| C_AttachFormat | $attach_format | printf-like format string for the attachment menu |
| C_AttachSaveDir | $attach_save_dir | Default directory where attachments are saved |
| C_AttachSaveWithoutPrompting | $attach_save_without_prompting | If true, then don't prompt to save |
| C_AttachSep | $attach_sep | Separator to add between saved/printed/piped attachments |
| C_AttachSplit | $attach_split | Save/print/pipe tagged messages individually |
| C_Attribution | $attribution | Message to start a reply, "On DATE, PERSON wrote:" |
| C_AttributionLocale | $attribution_locale | Locale for dates in the attribution message |
| C_AutocryptAcctFormat | $autocrypt_acct_format | Format of the autocrypt account menu |
| C_Autocrypt | $autocrypt | Enables the Autocrypt feature |
| C_AutocryptDir | $autocrypt_dir | Location of autocrypt files, including the GPG keyring and SQLite database |
| C_AutocryptReply | $autocrypt_reply | Replying to an autocrypt email automatically enables autocrypt in the reply |
| C_Autoedit | $autoedit | Skip the initial compose menu and edit the email |
| C_AutoSubscribe | $auto_subscribe | Automatically check if the user is subscribed to a mailing list |
| C_AutoTag | $auto_tag | Automatically apply actions to all tagged messages |
| C_Beep | $beep | Make a noise when an error occurs |
| C_BeepNew | $beep_new | Make a noise when new mail arrives |
| C_Bounce | $bounce | Confirm before bouncing a message |
| C_BrailleFriendly | $braille_friendly | Move the cursor to the beginning of the line |
| C_BrowserAbbreviateMailboxes | $browser_abbreviate_mailboxes | Abbreviate mailboxes using '~' and '=' in the browser |
| C_CatchupNewsgroup | $catchup_newsgroup | (nntp) Mark all articles as read when leaving a newsgroup |
| C_CertificateFile | $certificate_file | (ssl) File containing trusted certificates |
| C_ChangeFolderNext | $change_folder_next | Suggest the next folder, rather than the first when using '<change-folder>' |
| C_Charset | $charset | Default character set for displaying text on screen |
| C_CheckMboxSize | $check_mbox_size | (mbox,mmdf) Use mailbox size as an indicator of new mail |
| C_CheckNew | $check_new | (maildir,mh) Check for new mail while the mailbox is open |
| C_CollapseAll | $collapse_all | Collapse all threads when entering a folder |
| C_CollapseFlagged | $collapse_flagged | Prevent the collapse of threads with flagged emails |
| C_CollapseUnread | $collapse_unread | Prevent the collapse of threads with unread emails |
| C_ConfigCharset | $config_charset | Character set that the config files are in |
| C_Confirmappend | $confirmappend | Confirm before appending emails to a mailbox |
| C_Confirmcreate | $confirmcreate | Confirm before creating a new mailbox |
| C_ConnectTimeout | $connect_timeout | Timeout for making network connections (-1 to wait indefinitely) |
| C_CopyDecodeWeed | $copy_decode_weed | Controls whether to weed headers when copying or saving emails |
| C_CountAlternatives | $count_alternatives | Recurse inside multipart/alternatives while counting attachments |
| C_CryptChars | $crypt_chars | User-configurable crypto flags: signed, encrypted etc. |
| C_CryptConfirmhook | $crypt_confirmhook | Prompt the user to confirm keys before use |
| C_CryptOpportunisticEncrypt | $crypt_opportunistic_encrypt | Enable encryption when the recipient's key is available |
| C_CryptOpportunisticEncryptStrongKeys | $crypt_opportunistic_encrypt_strong_keys | Enable encryption only when strong a key is available |
| C_CryptProtectedHeadersRead | $crypt_protected_headers_read | Display protected headers (Memory Hole) in the pager |
| C_CryptProtectedHeadersSave | $crypt_protected_headers_save | Save the cleartext Subject with the headers |
| C_CryptProtectedHeadersSubject | $crypt_protected_headers_subject | Use this as the subject for encrypted emails |
| C_CryptProtectedHeadersWrite | $crypt_protected_headers_write | Generate protected header (Memory Hole) for signed and encrypted emails |
| C_CryptTimestamp | $crypt_timestamp | Add a timestamp to PGP or SMIME output to prevent spoofing |
| C_CryptUseGpgme | $crypt_use_gpgme | Use GPGME crypto backend |
| C_CryptUsePka | $crypt_use_pka | Use GPGME to use PKA (lookup PGP keys using DNS) |
| C_CryptVerifySig | $crypt_verify_sig | Verify PGP or SMIME signatures |
| C_DateFormat | $date_format | strftime format string for the d expando |
| C_DebugFile | $debug_file | File to save debug logs |
| C_DebugLevel | $debug_level | Logging level for debug logs |
| C_DefaultHook | $default_hook | Pattern to use for hooks that only have a simple regex |
| C_Delete | $delete | Really delete messages, when the mailbox is closed |
| C_DeleteUntag | $delete_untag | Untag messages when they are marked for deletion |
| C_DigestCollapse | $digest_collapse | Hide the subparts of a multipart/digest |
| C_DisplayFilter | $display_filter | External command to pre-process an email before display |
| C_DuplicateThreads | $duplicate_threads | Highlight messages with duplicated message IDs |
| C_Editor | $editor | External command to use as an email editor |
| C_EntropyFile | $entropy_file | (ssl) File/device containing random data to initialise SSL |
| C_EnvelopeFromAddress | $envelope_from_address | Manually set the sender for outgoing messages |
| C_ExternalSearchCommand | $external_search_command | External search command |
| C_FlagChars | $flag_chars | User-configurable index flags: tagged, new, etc |
| C_FlagSafe | $flag_safe | Protect flagged messages from deletion |
| C_Folder | $folder | Base folder for a set of mailboxes |
| C_FolderFormat | $folder_format | printf-like format string for the browser's display of folders |
| C_FollowupToPoster | $followup_to_poster | (nntp) Reply to the poster if 'poster' is in the 'Followup-To' header |
| C_ForceName | $force_name | Save outgoing mail in a folder of their name |
| C_ForwardAttachments | $forward_attachments | Forward attachments when forwarding a message |
| C_ForwardDecode | $forward_decode | Decode the message when forwarding it |
| C_ForwardQuote | $forward_quote | Automatically quote a forwarded message using $indent_string |
| C_FromChars | $from_chars | User-configurable index flags: to address, cc address, etc |
| C_From | $from | Default 'From' address to use, if isn't otherwise set |
| C_GecosMask | $gecos_mask | Regex for parsing GECOS field of /etc/passwd |
| C_GroupIndexFormat | $group_index_format | (nntp) printf-like format string for the browser's display of newsgroups |
| C_HeaderCacheBackend | $header_cache_backend | (hcache) Header cache backend to use |
| C_HeaderCacheCompressLevel | $header_cache_compress_level | (hcache) Level of compression for method |
| C_HeaderCacheCompressMethod | $header_cache_compress_method | (hcache) Enable generic hcache database compression |
| C_HeaderCache | $header_cache | (hcache) Directory/file for the header cache database |
| C_HeaderColorPartial | $header_color_partial | Only colour the part of the header matching the regex |
| C_Header | $header | Include the message headers in the reply email (Weed applies) |
| C_HiddenTags | $hidden_tags | Tags that shouldn't be displayed on screen |
| C_HideLimited | $hide_limited | Don't indicate hidden messages, in the thread tree |
| C_HideMissing | $hide_missing | Don't indicate missing messages, in the thread tree |
| C_HideThreadSubject | $hide_thread_subject | Hide subjects that are similar to that of the parent message |
| C_HideTopLimited | $hide_top_limited | Don't indicate hidden top message, in the thread tree |
| C_HideTopMissing | $hide_top_missing | Don't indicate missing top message, in the thread tree |
| C_HistoryFile | $history_file | File to save history in |
| C_History | $history | Number of history entries to keep in memory per category |
| C_HistoryRemoveDups | $history_remove_dups | Remove duplicate entries from the history |
| C_HonorDisposition | $honor_disposition | Don't display MIME parts inline if they have a disposition of 'attachment' |
| C_Hostname | $hostname | Fully-qualified domain name of this machine |
| C_IdnDecode | $idn_decode | (idn) Decode international domain names |
| C_IdnEncode | $idn_encode | (idn) Encode international domain names |
| C_ImapAuthenticators | $imap_authenticators | (imap) List of allowed IMAP authentication methods |
| C_ImapCheckSubscribed | $imap_check_subscribed | (imap) When opening a mailbox, ask the server for a list of subscribed folders |
| C_ImapCondstore | $imap_condstore | (imap) Enable the CONDSTORE extension |
| C_ImapDeflate | $imap_deflate | (imap) Compress network traffic |
| C_ImapDelimChars | $imap_delim_chars | (imap) Characters that denote separators in IMAP folders |
| C_ImapFetchChunkSize | $imap_fetch_chunk_size | (imap) Download headers in blocks of this size |
| C_ImapHeaders | $imap_headers | (imap) Additional email headers to download when getting index |
| C_ImapIdle | $imap_idle | (imap) Use the IMAP IDLE extension to check for new mail |
| C_ImapKeepalive | $imap_keepalive | (imap) Time to wait before polling an open IMAP connection |
| C_ImapListSubscribed | $imap_list_subscribed | (imap) When browsing a mailbox, only display subscribed folders |
| C_ImapLogin | $imap_login | (imap) Login name for the IMAP server (defaults to $imap_user) |
| C_ImapOauthRefreshCommand | $imap_oauth_refresh_command | (imap) External command to generate OAUTH refresh token |
| C_ImapPass | $imap_pass | (imap) Password for the IMAP server |
| C_ImapPassive | $imap_passive | (imap) Reuse an existing IMAP connection to check for new mail |
| C_ImapPeek | $imap_peek | (imap) Don't mark messages as read when fetching them from the server |
| C_ImapPipelineDepth | $imap_pipeline_depth | (imap) Number of IMAP commands that may be queued up |
| C_ImapPollTimeout | $imap_poll_timeout | (imap) Maximum time to wait for a server response |
| C_ImapQresync | $imap_qresync | (imap) Enable the QRESYNC extension |
| C_ImapRfc5161 | $imap_rfc5161 | (imap) Use the IMAP ENABLE extension to select capabilities |
| C_ImapServernoise | $imap_servernoise | (imap) Display server warnings as error messages |
| C_ImapUser | $imap_user | (imap) Username for the IMAP server |
| C_ImplicitAutoview | $implicit_autoview | Display MIME attachments inline if a 'copiousoutput' mailcap entry exists |
| C_IncludeEncrypted | $include_encrypted | Whether to include encrypted content when replying |
| C_IncludeOnlyfirst | $include_onlyfirst | Only include the first attachment when replying |
| C_IndentString | $indent_string | String used to indent 'reply' text |
| C_IndexFormat | $index_format | printf-like format string for the index menu (emails) |
| C_KeepFlagged | $keep_flagged | Don't move flagged messages from $spoolfile to $mbox |
| C_MailcapPath | $mailcap_path | Colon-separated list of mailcap files |
| C_MailcapSanitize | $mailcap_sanitize | Restrict the possible characters in mailcap expandos |
| C_MailCheck | $mail_check | Number of seconds before NeoMutt checks for new mail |
| C_MailCheckRecent | $mail_check_recent | Notify the user about new mail since the last time the mailbox was opened |
| C_MailCheckStatsInterval | $mail_check_stats_interval | How often to check for new mail |
| C_MailCheckStats | $mail_check_stats | Periodically check for new mail |
| C_MaildirCheckCur | $maildir_check_cur | Check both 'new' and 'cur' directories for new mail |
| C_MaildirHeaderCacheVerify | $maildir_header_cache_verify | (hcache) Check for maildir changes when opening mailbox |
| C_MaildirTrash | $maildir_trash | Use the maildir 'trashed' flag, rather than deleting |
| C_Markers | $markers | Display a '+' at the beginning of wrapped lines in the pager |
| C_MarkMacroPrefix | $mark_macro_prefix | Prefix for macros using '<mark-message>' |
| C_MarkOld | $mark_old | Mark new emails as old when leaving the mailbox |
| C_Mask | $mask | Only display files/dirs matching this regex in the browser |
| C_Mbox | $mbox | Folder that receives read emails (see Move) |
| C_MboxType | $mbox_type | Default type for creating new mailboxes |
| C_MenuContext | $menu_context | Number of lines of overlap when changing pages in the index |
| C_MenuMoveOff | $menu_move_off | Allow the last menu item to move off the bottom of the screen |
| C_MenuScroll | $menu_scroll | Scroll the menu/index by one line, rather than a page |
| C_MessageCacheClean | $message_cache_clean | (imap/pop) Clean out obsolete entries from the message cache |
| C_MessageCachedir | $message_cachedir | (imap/pop) Directory for the message cache |
| C_MessageFormat | $message_format | printf-like format string for listing attached messages |
| C_MetaKey | $meta_key | Interpret 'ALT-x' as 'ESC-x' |
| C_MhPurge | $mh_purge | Really delete files in MH mailboxes |
| C_MhSeqFlagged | $mh_seq_flagged | MH sequence for flagged message |
| C_MhSeqReplied | $mh_seq_replied | MH sequence to tag replied messages |
| C_MhSeqUnseen | $mh_seq_unseen | MH sequence for unseen messages |
| C_MimeForward | $mime_forward | Forward a message as a 'message/RFC822' MIME part |
| C_MimeForwardRest | $mime_forward_rest | Forward all attachments, even if they can't be decoded |
| C_MixEntryFormat | $mix_entry_format | (mixmaster) printf-like format string for the mixmaster chain |
| C_Mixmaster | $mixmaster | (mixmaster) External command to route a mixmaster message |
| C_Move | $move | Move emails from $spoolfile to $mbox when read |
| C_NarrowTree | $narrow_tree | Draw a narrower thread tree in the index |
| C_NetInc | $net_inc | (socket) Update the progress bar after this many KB sent/received (0 to disable) |
| C_NewMailCommand | $new_mail_command | External command to run when new mail arrives |
| C_NewsCacheDir | $news_cache_dir | (nntp) Directory for cached news articles |
| C_NewsgroupsCharset | $newsgroups_charset | (nntp) Character set of newsgroups' descriptions |
| C_Newsrc | $newsrc | (nntp) File containing list of subscribed newsgroups |
| C_NewsServer | $news_server | (nntp) Url of the news server |
| C_NmDbLimit | $nm_db_limit | (notmuch) Default limit for Notmuch queries |
| C_NmDefaultUrl | $nm_default_url | (notmuch) Path to the Notmuch database |
| C_NmExcludeTags | $nm_exclude_tags | (notmuch) Exclude messages with these tags |
| C_NmFlaggedTag | $nm_flagged_tag | (notmuch) Tag to use for flagged messages |
| C_NmOpenTimeout | $nm_open_timeout | (notmuch) Database timeout |
| C_NmQueryType | $nm_query_type | (notmuch) Default query type: 'threads' or 'messages' |
| C_NmQueryWindowCurrentPosition | $nm_query_window_current_position | (notmuch) Position of current search window |
| C_NmQueryWindowCurrentSearch | $nm_query_window_current_search | (notmuch) Current search parameters |
| C_NmQueryWindowDuration | $nm_query_window_duration | (notmuch) Time duration of the current search window |
| C_NmQueryWindowTimebase | $nm_query_window_timebase | (notmuch) Units for the time duration |
| C_NmRecordTags | $nm_record_tags | (notmuch) Tags to apply to the 'record' mailbox (sent mail) |
| C_NmRepliedTag | $nm_replied_tag | (notmuch) Tag to use for replied messages |
| C_NmUnreadTag | $nm_unread_tag | (notmuch) Tag to use for unread messages |
| C_NntpAuthenticators | $nntp_authenticators | (nntp) Allowed authentication methods |
| C_NntpContext | $nntp_context | (nntp) Maximum number of articles to list (0 for all articles) |
| C_NntpListgroup | $nntp_listgroup | (nntp) Check all articles when opening a newsgroup |
| C_NntpLoadDescription | $nntp_load_description | (nntp) Load descriptions for newsgroups when adding to the list |
| C_NntpPass | $nntp_pass | (nntp) Password for the news server |
| C_NntpPoll | $nntp_poll | (nntp) Interval between checks for new posts |
| C_NntpUser | $nntp_user | (nntp) Username for the news server |
| C_PagerContext | $pager_context | Number of lines of overlap when changing pages in the pager |
| C_PagerFormat | $pager_format | printf-like format string for the pager's status bar |
| C_PagerIndexLines | $pager_index_lines | Number of index lines to display above the pager |
| C_Pager | $pager | External command for viewing messages, or 'builtin' to use NeoMutt's |
| C_PagerStop | $pager_stop | Don't automatically open the next message when at the end of a message |
| C_PatternFormat | $pattern_format | printf-like format string for the pattern completion menu |
| C_PgpAutoDecode | $pgp_auto_decode | Automatically decrypt PGP messages |
| C_PgpAutoinline | $pgp_autoinline | Use old-style inline PGP messages (not recommended) |
| C_PgpCheckExit | $pgp_check_exit | Check the exit code of PGP subprocess |
| C_PgpCheckGpgDecryptStatusFd | $pgp_check_gpg_decrypt_status_fd | File descriptor used for status info |
| C_PgpClearsignCommand | $pgp_clearsign_command | (pgp) External command to inline-sign a message |
| C_PgpDecodeCommand | $pgp_decode_command | (pgp) External command to decode a PGP attachment |
| C_PgpDecryptCommand | $pgp_decrypt_command | (pgp) External command to decrypt a PGP message |
| C_PgpDecryptionOkay | $pgp_decryption_okay | Text indicating a successful decryption |
| C_PgpDefaultKey | $pgp_default_key | Default key to use for PGP operations |
| C_PgpEncryptOnlyCommand | $pgp_encrypt_only_command | (pgp) External command to encrypt, but not sign a message |
| C_PgpEncryptSignCommand | $pgp_encrypt_sign_command | (pgp) External command to encrypt and sign a message |
| C_PgpEntryFormat | $pgp_entry_format | printf-like format string for the PGP key selection menu |
| C_PgpExportCommand | $pgp_export_command | (pgp) External command to export a public key from the user's keyring |
| C_PgpGetkeysCommand | $pgp_getkeys_command | (pgp) External command to download a key for an email address |
| C_PgpGoodSign | $pgp_good_sign | Text indicating a good signature |
| C_PgpIgnoreSubkeys | $pgp_ignore_subkeys | Only use the principal PGP key |
| C_PgpImportCommand | $pgp_import_command | (pgp) External command to import a key into the user's keyring |
| C_PgpListPubringCommand | $pgp_list_pubring_command | (pgp) External command to list the public keys in a user's keyring |
| C_PgpListSecringCommand | $pgp_list_secring_command | (pgp) External command to list the private keys in a user's keyring |
| C_PgpLongIds | $pgp_long_ids | Display long PGP key IDs to the user |
| C_PgpMimeAuto | $pgp_mime_auto | Prompt the user to use MIME if inline PGP fails |
| C_PgpRetainableSigs | $pgp_retainable_sigs | Create nested multipart/signed or encrypted messages |
| C_PgpSelfEncrypt | $pgp_self_encrypt | Encrypted messages will also be encrypted to $pgp_default_key too |
| C_PgpShowUnusable | $pgp_show_unusable | Show non-usable keys in the key selection |
| C_PgpSignAs | $pgp_sign_as | Use this alternative key for signing messages |
| C_PgpSignCommand | $pgp_sign_command | (pgp) External command to create a detached PGP signature |
| C_PgpSortKeys | $pgp_sort_keys | Sort order for PGP keys |
| C_PgpStrictEnc | $pgp_strict_enc | Encode PGP signed messages with quoted-printable (don't unset) |
| C_PgpTimeout | $pgp_timeout | Time in seconds to cache a passphrase |
| C_PgpUseGpgAgent | $pgp_use_gpg_agent | Use a PGP agent for caching passwords |
| C_PgpVerifyCommand | $pgp_verify_command | (pgp) External command to verify PGP signatures |
| C_PgpVerifyKeyCommand | $pgp_verify_key_command | (pgp) External command to verify key information |
| C_PipeDecode | $pipe_decode | Decode the message when piping it |
| C_PipeDecodeWeed | $pipe_decode_weed | Control whether to weed headers when piping an email |
| C_PipeSep | $pipe_sep | Separator to add between multiple piped messages |
| C_PipeSplit | $pipe_split | Run the pipe command on each message separately |
| C_PopAuthenticators | $pop_authenticators | (pop) List of allowed authentication methods |
| C_PopAuthTryAll | $pop_auth_try_all | (pop) Try all available authentication methods |
| C_PopCheckinterval | $pop_checkinterval | (pop) Interval between checks for new mail |
| C_PopDelete | $pop_delete | (pop) After downloading POP messages, delete them on the server |
| C_PopHost | $pop_host | (pop) Url of the POP server |
| C_PopLast | $pop_last | (pop) Use the 'LAST' command to fetch new mail |
| C_PopOauthRefreshCommand | $pop_oauth_refresh_command | (pop) External command to generate OAUTH refresh token |
| C_PopPass | $pop_pass | (pop) Password of the POP server |
| C_PopReconnect | $pop_reconnect | (pop) Reconnect to the server is the connection is lost |
| C_PopUser | $pop_user | (pop) Username of the POP server |
| C_PostModerated | $post_moderated | (nntp) Allow posting to moderated newsgroups |
| C_Postponed | $postponed | Folder to store postponed messages |
| C_Preconnect | $preconnect | External command to run prior to opening a socket |
| C_PreferredLanguages | $preferred_languages | Preferred languages for multilingual MIME |
| C_PrintCommand | $print_command | External command to print a message |
| C_PrintDecode | $print_decode | Decode message before printing it |
| C_PrintDecodeWeed | $print_decode_weed | Control whether to weed headers when printing an email |
| C_Print | Confirm before printing a message | |
| C_PrintSplit | $print_split | Print multiple messages separately |
| C_PromptAfter | $prompt_after | Pause after running an external pager |
| C_Quit | $quit | Prompt before exiting NeoMutt |
| C_QuoteRegex | $quote_regex | Regex to match quoted text in a reply |
| C_ReadInc | $read_inc | Update the progress bar after this many records read (0 to disable) |
| C_ReadOnly | $read_only | Open folders in read-only mode |
| C_Realname | $realname | Real name of the user |
| C_Record | $record | Folder to save 'sent' messages |
| C_ReflowSpaceQuotes | $reflow_space_quotes | Insert spaces into reply quotes for 'format=flowed' messages |
| C_ReflowText | $reflow_text | Reformat paragraphs of 'format=flowed' text |
| C_ReflowWrap | $reflow_wrap | Maximum paragraph width for reformatting 'format=flowed' text |
| C_ReplyRegex | $reply_regex | Regex to match message reply subjects like "re: " |
| C_Resolve | $resolve | Move to the next email whenever a command modifies an email |
| C_ResumeDraftFiles | $resume_draft_files | Process draft files like postponed messages |
| C_ResumeEditedDraftFiles | $resume_edited_draft_files | Resume editing previously saved draft files |
| C_ReverseAlias | $reverse_alias | Display the alias in the index, rather than the message's sender |
| C_Rfc2047Parameters | $rfc2047_parameters | Decode RFC2047-encoded MIME parameters |
| C_SaveAddress | $save_address | Use sender's full address as a default save folder |
| C_SaveEmpty | $save_empty | (mbox,mmdf) Preserve empty mailboxes |
| C_SaveHistory | $save_history | Number of history entries to save per category |
| C_SaveName | $save_name | Save outgoing message to mailbox of recipient's name if it exists |
| C_SaveUnsubscribed | $save_unsubscribed | (nntp) Save a list of unsubscribed newsgroups to the 'newsrc' |
| C_Score | $score | Use message scoring |
| C_ScoreThresholdDelete | $score_threshold_delete | Messages with a lower score will be automatically deleted |
| C_ScoreThresholdFlag | $score_threshold_flag | Messages with a greater score will be automatically flagged |
| C_ScoreThresholdRead | $score_threshold_read | Messages with a lower score will be automatically marked read |
| C_SearchContext | $search_context | Context to display around search matches |
| C_SendCharset | $send_charset | Character sets for outgoing mail |
| C_Shell | $shell | External command to run subshells in |
| C_ShowMultipartAlternative | $show_multipart_alternative | How to display 'multipart/alternative' MIME parts |
| C_ShowNewNews | $show_new_news | (nntp) Check for new newsgroups when entering the browser |
| C_ShowOnlyUnread | $show_only_unread | (nntp) Only show subscribed newsgroups with unread articles |
| C_SidebarComponentDepth | $sidebar_component_depth | (sidebar) Strip leading path components from sidebar folders |
| C_SidebarDelimChars | $sidebar_delim_chars | (sidebar) Characters that separate nested folders |
| C_SidebarDividerChar | $sidebar_divider_char | (sidebar) Character to draw between the sidebar and index |
| C_SidebarFolderIndent | $sidebar_folder_indent | (sidebar) Indent nested folders |
| C_SidebarFormat | $sidebar_format | (sidebar) printf-like format string for the sidebar panel |
| C_SidebarIndentString | $sidebar_indent_string | (sidebar) Indent nested folders using this string |
| C_SidebarNewMailOnly | $sidebar_new_mail_only | (sidebar) Only show folders with new/flagged mail |
| C_SidebarNextNewWrap | $sidebar_next_new_wrap | (sidebar) Wrap around when searching for the next mailbox with new mail |
| C_SidebarNonEmptyMailboxOnly | $sidebar_non_empty_mailbox_only | (sidebar) Only show folders with a non-zero number of mail |
| C_SidebarOnRight | $sidebar_on_right | (sidebar) Display the sidebar on the right |
| C_SidebarShortPath | $sidebar_short_path | (sidebar) Abbreviate the paths using the $folder variable |
| C_SidebarSortMethod | $sidebar_sort_method | (sidebar) Method to sort the sidebar |
| C_SidebarVisible | $sidebar_visible | (sidebar) Show the sidebar |
| C_SidebarWidth | $sidebar_width | (sidebar) Width of the sidebar |
| C_SimpleSearch | $simple_search | Pattern to search for when search doesn't contain ~'s |
| C_SizeShowBytes | $size_show_bytes | Show smaller sizes in bytes |
| C_SizeShowFractions | $size_show_fractions | Show size fractions with a single decimal place |
| C_SizeShowMb | $size_show_mb | Show sizes in megabytes for sizes greater than 1 megabyte |
| C_SizeUnitsOnLeft | $size_units_on_left | Show the units as a prefix to the size |
| C_SkipQuotedOffset | $skip_quoted_offset | Lines of context to show when skipping quoted text |
| C_SleepTime | $sleep_time | Time to pause after certain info messages |
| C_SmartWrap | $smart_wrap | Wrap text at word boundaries |
| C_Smileys | $smileys | Regex to match smileys to prevent mistakes when quoting text |
| C_SmimeAskCertLabel | $smime_ask_cert_label | Prompt the user for a label for SMIME certificates |
| C_SmimeCaLocation | $smime_ca_location | File containing trusted certificates |
| C_SmimeCertificates | $smime_certificates | File containing user's public certificates |
| C_SmimeDecryptCommand | $smime_decrypt_command | (smime) External command to decrypt an SMIME message |
| C_SmimeDecryptUseDefaultKey | $smime_decrypt_use_default_key | Use the default key for decryption |
| C_SmimeDefaultKey | $smime_default_key | Default key for SMIME operations |
| C_SmimeEncryptCommand | $smime_encrypt_command | (smime) External command to encrypt a message |
| C_SmimeEncryptWith | $smime_encrypt_with | Algorithm for encryption |
| C_SmimeGetCertCommand | $smime_get_cert_command | (smime) External command to extract a certificate from a message |
| C_SmimeGetCertEmailCommand | $smime_get_cert_email_command | (smime) External command to get a certificate for an email |
| C_SmimeGetSignerCertCommand | $smime_get_signer_cert_command | (smime) External command to extract a certificate from an email |
| C_SmimeImportCertCommand | $smime_import_cert_command | (smime) External command to import a certificate |
| C_SmimeIsDefault | $smime_is_default | Use SMIME rather than PGP by default |
| C_SmimeKeys | $smime_keys | File containing user's private certificates |
| C_SmimePk7outCommand | $smime_pk7out_command | (smime) External command to extract a public certificate |
| C_SmimeSelfEncrypt | $smime_self_encrypt | Encrypted messages will also be encrypt to $smime_default_key too |
| C_SmimeSignAs | $smime_sign_as | Use this alternative key for signing messages |
| C_SmimeSignCommand | $smime_sign_command | (smime) External command to sign a message |
| C_SmimeSignDigestAlg | $smime_sign_digest_alg | Digest algorithm |
| C_SmimeTimeout | $smime_timeout | Time in seconds to cache a passphrase |
| C_SmimeVerifyCommand | $smime_verify_command | (smime) External command to verify a signed message |
| C_SmimeVerifyOpaqueCommand | $smime_verify_opaque_command | (smime) External command to verify a signature |
| C_SortAux | $sort_aux | Secondary sort method for the index |
| C_SortBrowser | $sort_browser | Sort method for the browser |
| C_SortRe | $sort_re | Sort method for the sidebar |
| C_Sort | $sort | Sort method for the index |
| C_SpamSeparator | $spam_separator | Separator for multiple spam headers |
| C_Spoolfile | $spoolfile | Inbox |
| C_SslCaCertificatesFile | $ssl_ca_certificates_file | File containing trusted CA certificates |
| C_SslCiphers | $ssl_ciphers | (ssl) Ciphers to use when using SSL |
| C_SslClientCert | $ssl_client_cert | (ssl) File containing client certificates |
| C_SslForceTls | $ssl_force_tls | (ssl) Require TLS encryption for all connections |
| C_SslMinDhPrimeBits | $ssl_min_dh_prime_bits | Minimum keysize for Diffie-Hellman key exchange |
| C_SslStarttls | $ssl_starttls | (ssl) Use STARTTLS on servers advertising the capability |
| C_SslUseSslv3 | $ssl_use_sslv3 | (ssl) INSECURE: Use SSLv3 for authentication |
| C_SslUseTlsv11 | $ssl_use_tlsv1_1 | (ssl) Use TLSv1.1 for authentication |
| C_SslUseTlsv12 | $ssl_use_tlsv1_2 | (ssl) Use TLSv1.2 for authentication |
| C_SslUseTlsv13 | $ssl_use_tlsv1_3 | (ssl) Use TLSv1.3 for authentication |
| C_SslUseTlsv1 | $ssl_use_tlsv1 | (ssl) Use TLSv1 for authentication |
| C_SslVerifyDates | $ssl_verify_dates | (ssl) Verify the dates on the server certificate |
| C_SslVerifyHost | $ssl_verify_host | (ssl) Verify the server's hostname against the certificate |
| C_SslVerifyPartialChains | $ssl_verify_partial_chains | (ssl) Allow verification using partial certificate chains |
| C_StatusChars | $status_chars | Indicator characters for the status bar |
| C_StatusFormat | $status_format | printf-like format string for the index's status line |
| C_StatusOnTop | $status_on_top | Display the status bar at the top |
| C_StrictThreads | $strict_threads | Thread messages using 'In-Reply-To' and 'References' headers |
| C_Suspend | $suspend | Allow the user to suspend NeoMutt using '^Z' |
| C_TextFlowed | $text_flowed | Generate 'format=flowed' messages |
| C_ThoroughSearch | $thorough_search | Decode headers and messages before searching them |
| C_ThreadReceived | $thread_received | Sort threaded messages by their received date |
| C_Tilde | $tilde | Character to pad blank lines in the pager |
| C_TimeInc | $time_inc | Frequency of progress bar updates (milliseconds) |
| C_Timeout | $timeout | Time to wait for user input in menus |
| C_Tmpdir | $tmpdir | Directory for temporary files |
| C_ToChars | $to_chars | Indicator characters for the 'To' field in the index |
| C_ToggleQuotedShowLevels | $toggle_quoted_show_levels | Number of quote levels to show with toggle-quoted |
| C_Trash | $trash | Folder to put deleted emails |
| C_TsEnabled | $ts_enabled | Allow NeoMutt to set the terminal status line and icon |
| C_TsIconFormat | $ts_icon_format | printf-like format string for the terminal's icon title |
| C_TsStatusFormat | $ts_status_format | printf-like format string for the terminal's status (window title) |
| C_TunnelIsSecure | $tunnel_is_secure | Assume a tunneled connection is secure |
| C_Tunnel | $tunnel | Shell command to establish a tunnel |
| C_UncollapseJump | $uncollapse_jump | When opening a thread, jump to the next unread message |
| C_UncollapseNew | $uncollapse_new | Open collapsed threads when new mail arrives |
| C_UseDomain | $use_domain | Qualify local addresses using this domain |
| C_UseIpv6 | $use_ipv6 | Lookup IPv6 addresses when making connections |
| C_VfolderFormat | $vfolder_format | (notmuch) printf-like format string for the browser's display of virtual folders |
| C_VirtualSpoolfile | $virtual_spoolfile | (notmuch) Use the first virtual mailbox as a spool file |
| C_Visual | $visual | Editor to use when '~v' is given in the built-in editor |
| C_WaitKey | $wait_key | Prompt to press a key after running external commands |
| C_Weed | $weed | Filter headers when displaying/forwarding/printing/replying |
| C_WrapSearch | $wrap_search | Wrap around when the search hits the end |
| C_Wrap | $wrap | Width to wrap text in the pager |
| C_WriteBcc | $write_bcc | Write out the 'Bcc' field when preparing to send a mail |
| C_WriteInc | $write_inc | Update the progress bar after this many records written (0 to disable) |
| C_XCommentTo | $x_comment_to | (nntp) Add 'X-Comment-To' header that contains article author |
