On Sun, Aug 31, 2025 at 02:44:48PM +0200, Antonin Verrier via mailop wrote:
> I have a customer that has their email hosted by Gandi (French domain
> registrar/hosting company) and can't send out emails because Gandi are using
> a subset of Spamhaus' RBL (XBL/SBL it seems) to filter access to mail
> submission (SMTPSA on port 465).
Actually, this is reasonable, I do the same on my submission server.
The XBL and SBL are not the PBL. While vast swaths of dynamic consumer
IP space are PBL listed, they are rarely XBL or SBL listed.
So my Postfix MSA rejects XBL-listed clients:
submission inet n - n - - smtpd
-o smtpd_delay_reject=no
-o {smtpd_client_restrictions=reject_rbl_client
zen.spamhaus.org=127.0.0.4}
...
Somewhat reducing the log noise due to futile SASL brute-forcing
attempts.
--
Viktor. 🇺🇦 Слава Україні!
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