Taking e-mail back, part 3: Fortifying your box against spammers ift.tt/1exBM8u Aurich Lawson Its time for part 3 of getting your e-mail server up and running! We have six main tasks with this segment, each of which has its own chunk of subtasks. Well go through them in roughly this order: Install OpenDKIM so that we can use DomainKeys Identified Mail to help recipient domains validate that the e-mail we send actually comes from us Install SpamAssassin for spam filtering Install ClamAV for virus scanning (though this is somewhat optional, as well discuss when we get there) Configure SpamAssassin and ClamAV and talk a bit about spam filtering Configure our external DNS and talk a bit about how to handle internal DNS as well (as part of this, well set up DKIM and SPF records and also talk about reverse-lookups) Set up some server-side mail filters with Sieve to toss spam and do some other neat tricks After completing part 2, our e-mail server has an almost fully configured Postfix and Dovecot stack. However, there is additional functionality that we need to bolt on to Postfix in order to make it behave like a big-boy SMTP server. We need it to be able to filter out spam and viruses, and we need to be able to tag our outgoing e-mails with a cryptographic hash to help prove that theyre legit e-mails that were actually sending. To add this functionality to Postfix, were going to be installing a number of milters—mail filter applications. You might have noticed a commented-out line in Postfixs main.cf config file in part 2 that mentioned milters. Once we have them all installed, well uncomment that line to get them working. Read 135 remaining paragraphs | Comments
Posted on: Sat, 22 Mar 2014 12:46:29 +0000
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