The SMTP port amavis listens on so the MTA can hand mail over for virus and spam scanning.
Not registered with IANA, but a de-facto standard: amavis's own Postfix documentation sets $inet_socket_port = 10024 and has Postfix hand mail off with content_filter=amavisfeed:[127.0.0.1]:10024. Connecting gets you an ESMTP greeting — "220 [127.0.0.1] ESMTP amavisd-new service ready" — so on a scan it reads as a mail server. It always pairs with 10025, the reinjection port amavis sends scanned mail back to.
Do not expose
This is an unauthenticated SMTP sink that accepts mail for onward delivery. Reachable from outside, it is an open relay into your own queue. The documented configuration binds it to 127.0.0.1.
$ printf 'QUIT\r\n' | nc -w 3 127.0.0.1 10024Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.