Outbound Emails Failing SPF Due to Missing IPv6 Addresses
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TechNinja57
I'm experiencing issues with outbound emails and meeting invites from my organization being rejected by the receiving side because of SPF misalignment. The emails are being sent from PH0P220CA0006.outlook.office365.com using the IPv6 address 2603:10b6:510:d3::15. It seems that this address is not included in the IPv6 range listed in spf.protection.outlook.com. Has anyone else encountered this issue?
Answers
Are the emails and invites using your organization's DKIM signature? Also, what SPF policy do you have in place, is it `-all` or `~all`? This can affect how SPF checks are handled.
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I've faced this problem too! My solution was to add the ipv6 option to my SPF records, and after a bit of time, the issue resolved itself. Might be worth trying that out!
NetworkWiz88: Did you add just the specific IPv6 address, or did you include a range?
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TechNinja57: Yes, the DKIM is configured correctly, and we’re using `~all` in our SPF policy.