On 2026-01-09 18:04, Joseph Tam via dovecot wrote:
102/189 (54%) were listed by at least one of the RBLs, with the
following stats
RBL hits rate rate (>0 hits)
(col#1) bl.blocklist.de 93 49% 91%
(col#2) auth.spamrats.com 52 28% 51%
(col#3) xbl.spamhaus.org 19 10% 19%
Forgot one caveat, try to avoid larger RBL's that list dynamic IPs as
well, while it might be tempting to try to stop all the 'bot' activity,
bots' are not the biggest threat, and are easier to stop.. blocking DUL
IPs too will only get you complaints..
It's the real bad actors that RBL's help for IMAP Auth protection ;)
Oh, and watch the increasing number of residential 'proxies'.. and do
you REALLY want people logging in through VPN's? You want to know who is
accessing your customer email accounts.
An even bigger threat, those people who still allow POP 110, or IMAP
143, be nice if that was deprecated in dovecot and every other mail
platform.. SSL/TLS only..
Have a great and safe 2026 everyone!
--
"Catch the Magic of Linux..."
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Visit us at http://www.linuxmagic.com @linuxmagic
A Wizard IT Company - For More Info http://www.wizard.ca
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