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My txt entry for my domain is as follows:

"v=spf1 a ip4:aspmx.googlemail.com ptr:aspmx.googlemail.com include:aspmx.googlemail.com -all"

I have also tried to use ptr in addition to a. However, I'm not sure I fully understand the difference between them. PTR seems to do a reverse lookup on the domain, whereas A simply references the A record in the zone file?

The header response from Gmail is:

Received-SPF: unknown (google.com: domain of [email protected] uses a mechanism not recognized by this client. unknown mechanisms: ))

Authentication-Results: mx.google.com; spf=permerror (google.com: domain of [email protected] uses a mechanism not recognized by this client. unknown mechanisms: )) [email protected]; dkim=neutral (no key) [email protected]

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2 Answers 2

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The correct TXT record for googlemail is "v=spf1 include:aspmx.googlemail.com ~all". You should also note the usage of ~all versus -all.

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  • Honestly, I don't think that is the cause because it's complaining about the mydomain.com query: "domain of [email protected] uses a mechanism not recognized by this client", but I'm going to try. The world of trial and error begins. Thanks for your input.
    – user29771
    Dec 21, 2009 at 16:41
  • What is the meaning of ~all versus -all? The documentation is a bit weak on this: openspf.org/SPF_Record_Syntax Aug 13, 2010 at 13:49
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Please see this page: Please see this page from Google: http://support.google.com/a/bin/answer.py?hl=en&answer=178723

Publishing an SPF record that uses -all instead of ~all may result in delivery problems. See >Google IP address ranges for details about the addresses for the Google Apps mail servers.

EDIT: You should also really be using DKIM. With DMARC standardization approaching, this is highly important.