<ul><li>Microsoft has introduced new sender requirements causing confusion among senders trying to comply.</li><li>The main question many senders have is what it means to have a compliant P2 sender address and to have a sender address that can accept replies.</li><li>Microsoft's announcement provides some clarification on this matter, particularly regarding RFC compliance.</li><li>For more detailed explanation on compliant sender addresses, a Valimail video has been shared breaking down P1 and P2 addresses.</li></ul>

Microsoft: P2 Sender Address Compliance

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