+3.231. sendmail_wait
+
+Type: number
+Default: 0
+
+Specifies the number of seconds to wait for the $sendmail process to finish
+before giving up and putting delivery in the background.
+
+Mutt interprets the value of this variable as follows:
+
++---------------------------------------------------------------------+
+|>0|number of seconds to wait for sendmail to finish before continuing|
+|--+------------------------------------------------------------------|
+|0 |wait forever for sendmail to finish |
+|--+------------------------------------------------------------------|
+|<0|always put sendmail in the background without waiting |
++---------------------------------------------------------------------+
+
+Note that if you specify a value other than 0, the output of the child process
+will be put in a temporary file. If there is some error, you will be informed
+as to where to find the output.
+
+3.232. shell
+
+Type: path
+Default: (empty)
+
+Command to use when spawning a subshell. By default, the user's login shell
+from /etc/passwd is used.
+
+3.233. sig_dashes
+
+Type: boolean
+Default: yes
+
+If set, a line containing ?-- ? (note the trailing space) will be inserted
+before your $signature. It is strongly recommended that you not unset this
+variable unless your signature contains just your name. The reason for this is
+because many software packages use ?-- \n? to detect your signature. For
+example, Mutt has the ability to highlight the signature in a different color
+in the builtin pager.
+
+3.234. sig_on_top
+
+Type: boolean
+Default: no
+
+If set, the signature will be included before any quoted or forwarded text. It
+is strongly recommended that you do not set this variable unless you really
+know what you are doing, and are prepared to take some heat from netiquette
+guardians.
+
+3.235. signature
+
+Type: path
+Default: ??/.signature?
+
+Specifies the filename of your signature, which is appended to all outgoing
+messages. If the filename ends with a pipe (?|?), it is assumed that filename
+is a shell command and input should be read from its standard output.
+
+3.236. simple_search
+
+Type: string
+Default: ??f %s | ?s %s?
+
+Specifies how Mutt should expand a simple search into a real search pattern. A
+simple search is one that does not contain any of the ??? pattern operators.
+See ?patterns? for more information on search patterns.
+
+For example, if you simply type ?joe? at a search or limit prompt, Mutt will
+automatically expand it to the value specified by this variable by replacing
+?%s? with the supplied string. For the default value, ?joe? would be expanded
+to: ??f joe | ?s joe?.
+
+3.237. sleep_time
+
+Type: number
+Default: 1
+
+Specifies time, in seconds, to pause while displaying certain informational
+messages, while moving from folder to folder and after expunging messages from
+the current folder. The default is to pause one second, so a value of zero for
+this option suppresses the pause.
+
+3.238. smart_wrap
+
+Type: boolean
+Default: yes
+
+Controls the display of lines longer than the screen width in the internal
+pager. If set, long lines are wrapped at a word boundary. If unset, lines are
+simply wrapped at the screen edge. Also see the $markers variable.
+
+3.239. smileys
+
+Type: regular expression
+Default: ?(>From )|(:[-^]?[][)(><}{|/DP])?
+
+The pager uses this variable to catch some common false positives of
+$quote_regexp, most notably smileys and not consider a line quoted text if it
+also matches $smileys. This mostly happens at the beginning of a line.
+
+3.240. smime_ask_cert_label
+
+Type: boolean
+Default: yes
+
+This flag controls whether you want to be asked to enter a label for a
+certificate about to be added to the database or not. It is set by default. (S/
+MIME only)
+
+3.241. smime_ca_location
+
+Type: path
+Default: (empty)
+
+This variable contains the name of either a directory, or a file which contains
+trusted certificates for use with OpenSSL. (S/MIME only)
+
+3.242. smime_certificates
+
+Type: path
+Default: (empty)
+
+Since for S/MIME there is no pubring/secring as with PGP, mutt has to handle
+storage and retrieval of keys by itself. This is very basic right now, and keys
+and certificates are stored in two different directories, both named as the
+hash-value retrieved from OpenSSL. There is an index file which contains
+mailbox-address keyid pairs, and which can be manually edited. This option
+points to the location of the certificates. (S/MIME only)
+
+3.243. smime_decrypt_command
+
+Type: string
+Default: (empty)
+
+This format string specifies a command which is used to decrypt application/
+x-pkcs7-mime attachments.
+
+The OpenSSL command formats have their own set of printf(3)-like sequences
+similar to PGP's:
+
++-----------------------------------------------------------------------------+
+|%f|Expands to the name of a file containing a message. |
+|--+--------------------------------------------------------------------------|
+|%s|Expands to the name of a file containing the signature part of a multipart|
+| |/signed attachment when verifying it. |
+|--+--------------------------------------------------------------------------|
+|%k|The key-pair specified with $smime_default_key |
+|--+--------------------------------------------------------------------------|
+|%c|One or more certificate IDs. |
+|--+--------------------------------------------------------------------------|
+|%a|The algorithm used for encryption. |
+|--+--------------------------------------------------------------------------|
+| |CA location: Depending on whether $smime_ca_location points to a directory|
+|%C|or file, this expands to ?-CApath $smime_ca_location? or ?-CAfile |
+| |$smime_ca_location?. |
++-----------------------------------------------------------------------------+
+
+For examples on how to configure these formats, see the smime.rc in the samples
+/ subdirectory which has been installed on your system alongside the
+documentation. (S/MIME only)
+
+3.244. smime_decrypt_use_default_key
+
+Type: boolean
+Default: yes
+
+If set (default) this tells mutt to use the default key for decryption.
+Otherwise, if managing multiple certificate-key-pairs, mutt will try to use the
+mailbox-address to determine the key to use. It will ask you to supply a key,
+if it can't find one. (S/MIME only)
+
+3.245. smime_default_key
+
+Type: string
+Default: (empty)
+
+This is the default key-pair to use for signing. This must be set to the keyid
+(the hash-value that OpenSSL generates) to work properly (S/MIME only)
+
+3.246. smime_encrypt_command
+
+Type: string
+Default: (empty)
+
+This command is used to create encrypted S/MIME messages.
+
+This is a format string, see the $smime_decrypt_command command for possible
+printf(3)-like sequences. (S/MIME only)
+
+3.247. smime_encrypt_with
+
+Type: string
+Default: (empty)
+
+This sets the algorithm that should be used for encryption. Valid choices are
+?des?, ?des3?, ?rc2-40?, ?rc2-64?, ?rc2-128?. If unset, ?3des? (TripleDES) is
+used. (S/MIME only)
+
+3.248. smime_get_cert_command
+
+Type: string
+Default: (empty)
+
+This command is used to extract X509 certificates from a PKCS7 structure.
+
+This is a format string, see the $smime_decrypt_command command for possible
+printf(3)-like sequences. (S/MIME only)
+
+3.249. smime_get_cert_email_command
+
+Type: string
+Default: (empty)
+
+This command is used to extract the mail address(es) used for storing X509
+certificates, and for verification purposes (to check whether the certificate
+was issued for the sender's mailbox).
+
+This is a format string, see the $smime_decrypt_command command for possible
+printf(3)-like sequences. (S/MIME only)
+
+3.250. smime_get_signer_cert_command