Office365/Hotmail IP addresses get SPF Fail / SPF record incorrect
Modified on: Tue, 10 Oct, 2023 at 10:37 AM
If you see a message sent from an Office365/hotmail email domain flagged for SPF Fail, it is because Office365 -occasionally- sends from IP addresses that are not contained by their new SPF include: statement.
Existing SPF "TXT" record for spf.protection.outlook.com
"v=spf1 ip4:188.8.131.52/15 ip4:184.108.40.206/16 ip4:220.127.116.11/14 ip4:18.104.22.168/17 ip6:2a01:111:f400::/48 ip6:2a01:111:f403::/48 include:spfd.protection.outlook.com -all"
What we have see is the sending IP is in the 22.214.171.124/24 range.
Add "126.96.36.199/14" to System Setup > Mail Authentication > SPF Bypassed IPs/Networks::
-- That will bypass SPF checks for that IP range.
-- That IP range that used to be in their SPF record, before it was changed.
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