# WHATPORT(10024)

## NAME

port 10024 — amavisd-new content filter — The SMTP port amavis listens on so the MTA can hand mail over for virus and spam scanning.

Protocol: TCP  
IANA registry

## DESCRIPTION

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.

## EXPOSURE

**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.

## CHECK

```sh
printf 'QUIT\r\n' | nc -w 3 127.0.0.1 10024
```

## SEE ALSO

- docs — [amavis — README.postfix ($inet_socket_port = 10024)](https://www.amavis.org/README.postfix.html) (amavis.org)
- iana — [IANA port registry — 10024 (no assignment)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=10024) (iana.org)

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HTML: <https://whatport.net/10024/> · JSON: <https://whatport.net/10024.json> · full dataset: <https://whatport.net/ports.json>