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I am currently running Postfix v2.1.1 on Suse Enterprise 9.0. I have looked over the highly complicated Postfix.org site and there are so many solutions. Is there not an easy email filtering system I can implement to either filter or reject email from domains I choose? Atleast steer me into the right direction.
Ok, no replies... Can anybody steer me in the right direction to better understand my mail system? Postfix is used for sending mail, but what is used for receiving mail? I'm a fast learner, just need a jump start.
If you want the opportunity to reject mail, then you need an MTA, such
as postfix or sendmail. If your ISP accepts mail for you and offers it
to you by IMAP or POP3, then it is too late for you to reject anything
(since the mail has already been accepted). The most you can do is
bounce what you don't like, but that is highly undesirable due to the
backscatter is causes; hence the need to run your own MTA. When you run
your own MTA, mail is delivered directly to a machine under your control.
Configuring an MTA requires some reading and understanding, especially if
you want to filter your mail. Between postfix and sendmail, postfix is the
simpler to configure and maintain. Disallowing mail based on envelope
headers (MAIL TO: and MAIL FROM: ) as well as the IP address of the
connecting client is best done at the MTA level, so that content-filters
such as SpamAssassin aren't necessary. SpamAssassin is useful for a deep
analysis of mail content (spam or links pointing to spammers' sites)
and routing history -- but this is best done after mail has been accepted.
Ok, thanks Berhanie. I believe Spamassassin is working. After doing some reading there was a line I needed to add to main.cf for Postfix to use Spamassassin.
The reason I wanted Spamassassin was due to the ability of blocking domains & email addresses. I know how to configure Postfix to do body checks and header checks, but couldn't figure out email address blocks.