[exim] heads-up: some spam bots started RCPT flooding

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
-- 
/ Markus Reschke              \
\ madires@??? /

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