Suggestion: check fail2ban sasl.conf for postfix smtpd
this problem was present on my up to date system after following the ispconfig3 guide for ubuntu 9.10 and google says some debian users had a similar problem too.(bug 573314)
If you want to block smtp brute force attempts you have to enable the sasl filter in jail.conf and change failregex in /etc/fail2ban/filter.d/sasl.conf to
This is a "works for me solution" :p
Thanks for the great guide, Ispconfig makes things so easy....
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