Yes.
On Mon, 9 Mar 2026, Dan Mahoney via Postfix-users wrote:
[...]
Return-Path: <[email protected]>
Received: from server-623641.inespre.gob.do (server-623641.inespre.gob.do
[50.6.199.138])
Does postfix have a knob to just let me block any server with any fully
qualified RDNS of *.gob.do, if this is the kind of thing that they're
letting happen? (Versus blocking the sender/recipient, or an IP block?)
You're mixing categories there, Dan. Return-Path: is the envelope sender;
that is MAIL FROM, right? Received: is client.
Take a look at the table in the _Getting selective with SMTP access
restriction lists_ section here:
https://www.postfix.org/SMTPD_ACCESS_README.html
You'll find check... actions documented with the *restrictions here:
https://www.postfix.org/postconf.5.html
You may also find the table included here illuminating:
http://athena.m3047.net/pub/postfix/postfix-restrictions-actions.html
--
Fred Morris, internet plumber
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