If at least one of the specified mechanisms matches the ones advertised by the
SMTP server and if it is supported by the utilized SASL library, the mechanism
is used for authentication. If neither 'sendemail.smtpAuth' nor `--smtp-auth`
-is specified, all mechanisms supported by the SASL library can be used.
+is specified, all mechanisms supported by the SASL library can be used. The
+special value 'none' maybe specified to completely disable authentication
+independently of `--smtp-user`
--smtp-pass[=<password>]::
Password for SMTP-AUTH. The argument is optional: If no
specified (with `--smtp-pass` or `sendemail.smtpPass`), then
a password is obtained using 'git-credential'.
+--no-smtp-auth::
+ Disable SMTP authentication. Short hand for `--smtp-auth=none`
+
--smtp-server=<host>::
If set, specifies the outgoing SMTP server to use (e.g.
`smtp.example.com` or a raw IP address). Alternatively it can