correct way to prevent SPF failures

Posted by Sean Kimball on Server Fault See other posts from Server Fault or by Sean Kimball
Published on 2012-09-29T00:10:32Z Indexed on 2012/09/29 3:40 UTC
Read the original article Hit count: 524

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dns

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email

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spam

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spf

I have a website on a hosted server whose mail users are using their ISPs SMTP to send mail.

I have set their SPF record to look like this:

v=spf1 mx a:comcast.net ip4:216.70.103.0/24 ip4:216.70.101.0/24 ip4:76.96.53.0/24 -all

the SMTP host is comcast.net, 76.96.53.0/24 is the ip range they get assigned from.
ip4:216.70.103.0/24 ip4:216.70.101.0/24 are the two possible SMTP ranges they could get IF they used their hosting account mail servers [media temple]

They are still getting SPF errors, any idea why?

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