Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?

Posted by Chris S on Server Fault See other posts from Server Fault or by Chris S
Published on 2012-08-20T20:30:19Z Indexed on 2012/08/31 3:40 UTC
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email

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spam

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spf

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dkim

This is a Canonical Question about Fighting Spam.

Also related: How to stop people from using my domain to send spam?

There are so many techniques and so much to know about fighting SPAM. What widely used techniques and technologies are available to Administrator, Domain Owners, and End Users to help keep the junk out of our inboxes?

We're looking for an answer that covers different tech from various angles. The accepted answer should include a variety of technologies (eg SPF/SenderID, DomainKeys/DKIM, Graylisting, DNS RBLs, Reputation Services, Filtering Software [SpamAssassin, etc]); best practices (eg mail on Port 25 should never be allowed to relay, Port 587 should be used; etc), terminology (eg, Open Relay, Backscatter, MSA/MTA/MUA, Spam/Ham), and possibly other techniques.

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