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For a customer I would like to implement SPF for a lot of domains they own, but most of the IP's are the same. I would like to create something like for example Google, so I can use the include: record : _spf.google.com ~all

What to do to make this work right?

MadHatter
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Tim Van Engeland
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2 Answers2

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Not tested but should work:

example.com TXT  "v=spf1 a mx ip:5.6.7.8/26 include:spf.yourdomain.com ~all"
example2.com TXT "v=spf1 a mx include:spf.yourdomain.com ~all"

and on your main, one domain:

spf.yourdomain.com TXT  "v=spf1 (multiple common values) -all"

You can add multiple entries (a mx), IP subnets and include. All SPF mechanisms can be used multiple times, separated by spaces. Of course it is your choice about ~all or -all etc (-all is much better, but you need test it first). Using include is nice, because later, if you need to make a change for SPF record for all domains (adding new IP, etc.) you need only change TXT record of "spf.yourdomain.com".

Jack
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you can easily generate here http://www.mailradar.com/spf/ and later validate http://www.kitterman.com/spf/validate.html

DisplayName
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