Hi!
Maybe you've already noticed some spam bots trying to deliver spam to
exactly 100 recipients in one wash up. They take a list of common user
names, add your domain name, and then loop through 100 RCPT TOs per mail.
To slow them down you could use the settings smtp_ratelimit_hosts and
smtp_ratelimit_rcpt. Be careful not to bother your customers/users with
too large delays. Lowering recipients_max is not really feasible as RFC
5321 clearly states a minimum of 100.
ciao
Markus
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/ Markus Reschke \
\ [email protected] /
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