Name: smtp_host
Type: STRING
Default-Value: localhost:587
Last-Modified: 3.1.4

The SMTP host to use for sending mail (also see the smtp_backend option).
The value of this option must the name or IP address of a TCP host,
followed optionally by a colon and the port or service to use. The default
port is 587.  TLS may be activated by appending \"/tls\" to the value.
Authentication is enabled if smtp_auth_authname is set. Authentication can
be explicitly disabled by appending \"/noauth\" to the host address.
