Bissio2000 put forth on 1/25/2011 8:25 AM: > Hi all, > > we have some problem with our ip reputation on other provider. We are using > our postfix server as delivery server for some mailing lists (about > 5000/8000 users); after a few days the destination providers (as hotmail, or > yahoo) block any message coming from our mta because our IP address is > inserted into their black list (not public black list). Is there a way to > use postfix as mailing list sender without looking as spammer? I mean is > there some setting on main.cf or somewhere to identify my mta server as > secure?
Your problem has nothing to do with Postfix, or any MTA you might use. Most of the big mailbox providers have bulk sender policies. If you are to send bulk mail to their users, you must ensure you meet their guidelines: http://help.yahoo.com/l/us/yahoo/mail/postmaster/bulkv2.html https://mail.google.com/support/bin/answer.py?hl=en&answer=81126 http://mail.live.com/mail/postmaster.aspx Others have asked the same or similar questions on this list. One recommendation is to create multiple smtp servers and institute parallelism and rate delays on them in order to deliver mail to the gorillas more slowly. Pipelining and pushing mail to them as fast as your server can send it will likely land you on their internal block lists, especially Yahoo, IIRC. This is likely what has happened to you. Similarly, if someone pumped 1000 mails into your smtpd server in a matter of seconds, multiple times a day, you probably wouldn't like that either. See the archives for instructions on configuring multiple Postfix smtp clients with limited/constrained delivery rates. -- Stan
