![]() if is sending from IP 192.168.1.1 that IP should have have the PTR on a reverse lookup of the IP, and a forward lookup of should resolve to 192.168.1.1. One last thing to check is that your sending mail server has a PTR record and that the PTR matches the hostname lookup. Check for syntax and tests to ensure it's valid. You can include ip blocks or whatever you need in the SPF to make sure all sending servers are covered. ![]() You can remove the SPF record, or, better yet, change the SPF to accurately reflect which servers are ok to send mail for the domain in question. However, if you're sending mail server is not included in the SPF that will definitely cause the SPF to fail for any destination servers that are checking it (like gmail). So you've made the switch to Mac, but kept your old PC, and now you've got both connected to your home router. If the mail servers that handle incoming mail (MX) do not also send out mail for that domain then they don't need to be in the SPF record (though it doesn't count against your spam score if you include them anyway). The SPF record should reflect which servers are approved to send mail on behalf of the domain.
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