`relaynomx`: `<boolean>` ('default =' `0`)::
-Disable MX lookups for default smtp relay.
-Will be ignored when choosing lmtp as transport protocol.
+Disable MX lookups for default relay (SMTP only, ignored for LMTP).
`relayport`: `<integer> (1 - 65535)` ('default =' `25`)::
SMTP/LMTP port number for relay host.
-`relayprotocol`: `<smtp | lmtp>` ('default =' `smtp`)::
+`relayprotocol`: `<lmtp | smtp>` ('default =' `smtp`)::
Transport protocol for relay host.