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copied!<p>Todd's answer is good, and when he's talking about reputation, he's hitting the nail on the head.</p> <p>Generally, not having SPF/DKIM/DMARC records has very little impact to your IP or domains reputation, and by extension, very little or no impact upon a particular messages deliverability. Take a look at the most widely deployed mail filters (SpamAssassin, Amavis) and you'll find that having matching SPF records provides no score increase. The same goes for DKIM. The reason for this is simple, it's very easy for spammers to publish SPF records and by harnessing the power of bot nets, the CPU cost of DKIM signing messages is negligible.</p> <p>Many spammers use throw-away domains (no reputation) they acquire for this very purpose, generally in TLDs that permit domain abuse like .info, .pw, .tw, and .biz. Just like Todd's points #2, and #3, if you happen to have a domain that is surrounded by spammers, it's just as bad as having an IP address or ASN with spammy neighbors.</p> <p>SPF, DKIM, and DMARC are all <em>authentication</em> mechanisms. They serve only to validate that the domain in question is responsible for a particular message. The reason a domain owner with a good reputation <em>should</em> publish a SPF record and DKIM sign their messages is to prevent spammers from sending emails from their domain, and thereby sullying their good reputation.</p> <p>Failing SPF, DKIM, and DMARC will definitely earn you negative points, in varying quantities.</p> <p>I'm on a couple DMARC mailing lists and I run one of about 20 mail systems on the internet that do DMARC reporting. I don't know of anyone handing out extra ham points for DMARC aligned messages. That isn't to say DMARC is not helpful. If your domain has a good reputation, and you publish DMARC records and a particular message is aligned, then your good reputation extends to that message. If the message is not aligned, then we have to decide if the message really is from you, and how much of your domains reputation should be afforded it.</p> <p>Another thing that's vitally important for a mail servers reputation is having properly configured DNS. Make absolutely certain your mail server's IP has matching forward and reverse DNS (FCrDNS), and that the hostname of the server is configured correctly, and that Exim is using the machines hostname.</p>

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