On Wed, Sep 16, 2026 at 05:30:31PM +0200, Ralph Seichter via Postfix-users
wrote:
> * Wietse Venema via Postfix-users:
>
> > This is already covered by existing sendmail (postdrop) features.
>
> Thank you. Mentioning postdrop was the nudge I needed. Configuring
> authorized_submit_users [1] achieves exactly what I was looking for,
> hassle-free.
The feature is by no means new, but is perhaps easily overlooked because
not often discussed on list.
20040918
Feature: authorized_flush_users, authorized_mailq_users,
authorized_submit_users to restrict what users can flush
the queue, list the queue, or submit mail locally. Based
on code by Victor Duchovni, Morgan Stanley. Files:
sendmail/sendmail.c, postdrop/postdrop.c, postqueue/postqueue.c,
global/user_acl.[hc].
This is especially useful in multi-instance Postfix deployments where
some instances might not be end-user facing and should allow local
submission only from "root" and "postfix".
--
Viktor. 🇺🇦 Слава Україні!
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