#mc886603 — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #mc886603, aggregated by home.social.
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Day 12 of #ITAdvent. Be sure to check whether you have apps/devices that send #mail with multiple FROM: headers (or P2) without a SENDER: header. To comply with RFC5322 #Microsoft365 will reject those mails.
Why? "Most of the traffic exhibiting multiple P2 From Addresses without a Sender Address will be inbound spam destined for your tenant sent by malicious spammers on the internet." as stated in #MC886603. However, you could have valid mail that does this.