✓Port 24

Well-known

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Service

any private mail system

Protocol

TCP

Description

IANA-reserved for any private mail system.

Citations

• Service Name and Transport Protocol Port Number Registry

Service

lmtp

Protocol

TCP

Description

The Local Mail Transfer Protocol (LMTP) is an alternative to (Extended) Simple Mail Transfer Protocol for situations where the receiving side does not have a mail queue, such as a message transfer agent acting as a message delivery agent. LMTP was described in RFC 2033 in 1996.

RFC

• RFC 2033 — Local Mail Transfer Protocol

Citations

• Local Mail Transfer Protocol (Wikipedia)