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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 ip4: ip4: ip4: -all
  • the SMTP host is, is the ip range they get assigned from.
  • ip4: ip4: 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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I'm not sure, but I think you need to set instead of because the mailservers are not listed as an A record under

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