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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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1 Answer 1

I'm not sure, but I think you need to set mx:comcast.net instead of a:comcast.net because the mailservers are not listed as an A record under comcast.net.

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