Hello, I am following another message which suggested that btinternet.com was blocking emails from domains without SPF records. This website suggests this is "common practice" in point 4: https://www.iplocation.net/email-delivery-problems
Do you have this kind of policy or any evidence of this behavior being common? I am just wondering about the percentage of mail servers with this kind of policy being in place. Regards
smime.p7s
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