Hello,
I am wondering why the default error limits in Postfix are set so high:
smtpd_soft_error_limit (default: 10)
smtpd_hard_error_limit (default: 20)
I have changed them to "3" and "${stress?1}${stress:5}" respectively,
and my servers is still being flooded with "relay access denied".
I am wondering whether it is advisable to lower the limits still. I am
asking, because when I analyze my logs, I only see spammers being
disconnected due to errors.
Are there cases where legitimate users make many errors?
What if I set the error limits very low:
smtpd_soft_error_limit=1
smtpd_hard_error_limit=3
Would that have unintended consequences?
And speaking of "relay access denied", what is the recommended way to
fight "relay access denied" attacks?
I would be happy if other people could share their experience
Thanks,
Martin
