Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

This question already has an answer here:

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 do-not-reply@example.com uses a mechanism not recognized by this client. unknown mechanisms: ))

Authentication-Results: mx.google.com; spf=permerror (google.com: domain of do-not-reply@example.com uses a mechanism not recognized by this client. unknown mechanisms: )) smtp.mail=do-not-reply@example.com; dkim=neutral (no key) header.i=@example.com

share|improve this question

migrated from stackoverflow.com Dec 20 '09 at 17:19

This question came from our site for professional and enthusiast programmers.

marked as duplicate by MadHatter, masegaloeh, Ward, mdpc, fuero yesterday

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

2 Answers 2

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

share|improve this answer
    
Honestly, I don't think that is the cause because it's complaining about the mydomain.com query: "domain of do-not-reply@mydomain.com 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: openspf.org/SPF_Record_Syntax –  Torben Gundtofte-Bruun Aug 13 '10 at 13:49

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.

share|improve this answer