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 ip4:18.104.22.168/24 ip4:22.214.171.124/24 ip4:126.96.36.199/24 -all
- the SMTP host is comcast.net, 188.8.131.52/24 is the ip range they get assigned from.
- ip4:184.108.40.206/24 ip4:220.127.116.11/24 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?