---
name: "ssmtp.conf"
section: "5"
platform: "linux"
package: "ssmtp"
version: "2.64-12"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ssmtp.conf"
---

# ssmtp.conf(5)

ssmtp configuration file

## NAME

**ssmtp.conf** – ssmtp configuration file

## DESCRIPTION

**ssmtp** reads configuration data from */etc/ssmtp/ssmtp.conf* The file contains keyword-argument pairs, one per line. Lines starting with ‘#’ and empty lines are interpreted as comments.

The possible keywords and their meanings are as follows (both are case-insensitive):

- **Root**

  The user that gets all mail for userids less than 1000. If blank, address rewriting is disabled.

- **Mailhub**

  The host to send mail to, in the form *host* *port* \| *IP\_addr* *port* \[: *port*\]. The default port is 25.

- **RewriteDomain**

  The domain from which mail seems to come. for user authentication.

- **Hostname**

  The full qualified name of the host. If not specified, the host is queried for its hostname.

- **FromLineOverride**

  Specifies whether the From header of an email, if any, may override the default domain. The default is “no”.

- **UseTLS**

  Specifies whether ssmtp uses TLS to talk to the SMTP server. The default is “no”.

- **UseSTARTTLS**

  Specifies whether ssmtp does a EHLO/STARTTLS before starting SSL negotiation. See RFC 2487.

- **TLSCert**

  The file name of an RSA certificate to use for TLS, if required.

- **AuthUser**

  The user name to use for SMTP AUTH. The default is blank, in which case SMTP AUTH is not used. sent without

- **AuthPass**

  The password to use for SMTP AUTH.

- **AuthMethod**

  The authorization method to use. If unset, plain text is used. May also be set to “cram-md5”.

## FILES

- */etc/ssmtp/ssmtp.conf*

  Contains configuration data for **ssmtp**.

## SEE ALSO

[ssmtp(8)](/ssmtp/8.md)

## AUTHORS

Matt Ryan (mryan@debian.org), Hugo Haas (hugo@debian.org), Christoph Lameter (clameter@debian.org) and Dave Collier-Brown (davecb@hobbes.ss.org). Reuben Thomas (rrt@sc3d.org) wrote the man page.