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My txt entry for my domain is as follows:

"v=spf1 a -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 ( domain of uses a mechanism not recognized by this client. unknown mechanisms: ))

Authentication-Results:; spf=permerror ( domain of uses a mechanism not recognized by this client. unknown mechanisms: )); dkim=neutral (no key)

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migrated from Dec 20 '09 at 17:19

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marked as duplicate by MadHatter, masegaloeh, Ward, mdpc, fuero Mar 4 at 12:44

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2 Answers 2

The correct TXT record for googlemail is "v=spf1 ~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 query: "domain of 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 '09 at 16:41
What is the meaning of ~all versus -all? The documentation is a bit weak on this: – Torben Gundtofte-Bruun Aug 13 '10 at 13:49

Please see this page: Please see this page from Google:

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.

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