I am looking into putting fail2ban on a mail server to help reduce the number of outbound spam attacks. Is there a way to set it up to notify me when a user exceeds a maximum number of authentications (successful or failed) in a given time frame? So far I can only find how to set it for failed attempts.
You can change the corresponding failregx so it matches successful and failed logins.
After reloading the jail, fail2ban triggers on both login-types.
If you have problems with outbound spam,you should check your system instead of using f2b as a workaround.
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