3 The default mail delivery transport (incoming mails).
5 `relaynomx`: `<boolean>` ('default =' `0`)::
7 Disable MX lookups for default relay (SMTP only, ignored for LMTP).
9 `relayport`: `<integer> (1 - 65535)` ('default =' `25`)::
11 SMTP/LMTP port number for relay host.
13 `relayprotocol`: `<lmtp | smtp>` ('default =' `smtp`)::
15 Transport protocol for relay host.
17 `smarthost`: `<string>` ::
19 When set, all outgoing mails are deliverd to the specified smarthost.
21 `smarthostport`: `<integer> (1 - 65535)` ('default =' `25`)::
23 SMTP port number for smarthost.