5 messages in net.sourceforge.lists.courier-usersRe: [courier-users] Limiting IMAP log...
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Mike JacksonDec 20, 2000 3:14 am 
Brian CandlerDec 20, 2000 4:11 am 
Mike JacksonDec 20, 2000 4:29 am 
Robert August Vincent IIDec 20, 2000 6:35 am 
Mike JacksonDec 20, 2000 7:56 am 
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Subject:Re: [courier-users] Limiting IMAP login frequencyActions...
From:Brian Candler (B.Ca@pobox.com)
Date:Dec 20, 2000 4:11:10 am
List:net.sourceforge.lists.courier-users

On Wed, Dec 20, 2000 at 01:14:54PM +0200, Mike Jackson wrote:

Does anyone have a method of limiting client login frequency from the server side? Ideally, it would pop a message back to the client informing him to set his frequency to x minutes, and would not allow him back on until it noticed a frequency of login attempts less than x in the syslog. While watching my log files for a new server, I noticed that many people are logging in every 30 seconds around the clock. One person was even logging in once per second!

Sounds to me that what you really want to do is block too-frequent connections from the same IP address, not the same user account.

Otherwise, by the time you have accepted the POP3 connection, authenticated the user, looked them up in a database of locked-out users and refused their login, you might as well just let them into their maildrop anyway.