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Blair Zajac
Asked: 2013-11-27 00:26:43 +0800 CST

Whose DKIM signature to use, my own or Amazon SES'?

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I have OpenDKIM properly set up to sign emails from my domain such that when sent through Amazon SES, Yahoo Mail shows dkim=pass. Given I got the infrastructure working, is there any benefit to having Amazon's DKIM signature instead of my own, say for spam filtering purposes?

spam

1 Answers

  1. If Amazon does it for free (Well, not free, but included with their per-message billing), Why should you spend resources in signing your emails?. Think of it as a matter of costs:

    • SES DKIM signed email = 1 x SES Message

    • Self calculated DKIM signed email = 1 x SES message + DKIM signature CPU

    It may sound insignificant, but think of tens of thousands of emails per month. That's a lot of CPU spent in something that SES is already doing by itself.

    If CPU spends are not a problem, double signing your emails should not be an issue at all.

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