On Tue, 2011-10-04 at 12:25 +0530, Dhanraj Wadhe wrote: > Hi All, > > We are public email provider with postfix at backend. We are facing > issue with getting black listed again and again. >
Blacklisted where ? by whom ? Usually If you get listed in any common blacklist you will get evidence why you got listed. You should be able to trace the problem Follow the general outgoing guidelines * Ratelimit the senders , monitor when people exceed "normal" rates * Do not allow any relay without authentication * Insist on using strong passwords * Sign up for FBL's and monitor the FBL's * If possible scan outgoing mails . ( Even a simple header check to catch Nigerian 419ers helps a lot in my case ) * Enable smtp auth user logging so that you can trace the culprit in case of an outbreak And all this has little to do with postfix :-)
