Filtering HELO / EHLO names before MAIL FROM

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Sujet : Filtering HELO / EHLO names before MAIL FROM
De : gtaylor (at) *nospam* tnetconsulting.net (Grant Taylor)
Groupes : comp.mail.sendmail
Date : 04. Jan 2025, 02:07:18
Autres entêtes
Organisation : TNet Consulting
Message-ID : <vla1k6$o3g$1@tncsrv09.home.tnetconsulting.net>
User-Agent : Mozilla Thunderbird
Hi,
Is there a method that I can use to filter & reject (return a 5xy error) for bad HELO / EHLO names at HELO / EHLO time?
I see some options (FEATURE(`block_bad_helo')) but they seem to apply later in the SMTP transaction.
I'm seeing what I suspect is bots looking to do credential stuffing, but I'm not offering authentication on this system, so they are bailing before usual protections would kick in.
Initial searches haven't turned up much that happens before MAIL FROM.
--
Grant. . . .

Date Sujet#  Auteur
4 Jan 25 * Filtering HELO / EHLO names before MAIL FROM7Grant Taylor
4 Jan 25 +* Re: Filtering HELO / EHLO names before MAIL FROM4Claus Aßmann
4 Jan 25 i`* Re: Filtering HELO / EHLO names before MAIL FROM3Grant Taylor
4 Jan 25 i `* Re: Filtering HELO / EHLO names before MAIL FROM2Claus Aßmann
5 Jan 25 i  `- Re: Filtering HELO / EHLO names before MAIL FROM1Grant Taylor
8 Jan 25 `* Re: Filtering HELO / EHLO names before MAIL FROM2Anthony Howe
8 Jan 25  `- Re: Filtering HELO / EHLO names before MAIL FROM1Grant Taylor

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