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I noticed that Gmail messages have both a DKIM-Signature header and a DomainKey-Signature header, while Hotmail messages have none.

  1. What is the purpose of using both DKIM and DomainKey signatures, as Gmail does?
  2. Is it fairly safe/compliant to use only DKIM, and not DomainKeys?
  3. How come Hotmail doesn't use any of these methods?

I'm sorry for combining a few questions under one: they don't seem to warrant individual entries.

Thanks!

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Googling those terms will quickly bring up the Wikipedia entries for DKIM and DomainKeys – Chris S♦ Jan 20 '11 at 13:47
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2 Answers

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  1. For additional authenticity verification.
  2. If you're going to take the time to set one up, why not do both?
  3. Ask them.
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DKIM "replaced" DomainKeys, almost nobody still uses DomainKeys. Very few places use DKIM either. SPF is much more popular and doesn't have all the problems DKIM does. – Chris S♦ Jan 20 '11 at 13:49
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@Chris S, Care to elaborate on the problems DKIM has? – HTTP500 Feb 10 '11 at 2:58
I too am interested in hearing about DKIM's problems. I've run it without issue for years now. SPF is complementary to, rather than a replacement for, DKIM. You should be using both. – blueben Feb 10 '11 at 4:14
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Microsoft is backing Sender ID - http://mail.live.com/mail/policies.aspx

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