

On November 1, 2023, we are removing the matching condition for the SMTP P2 sender domain (1c above).

SMTP envelope sender domain in the MAIL FROM command (P1 sender domain) or.SMTP certificate domain on the SMTP connection or.Any of the following is an accepted domain of your organization:.If your organization does not use Inbound Connectors of OnPremises type then this change will not affect you.Ĭurrently, to relay email through Exchange Online, two conditions must be true: Today, we are announcing an update to our requirements for SMTP relay through Exchange Online.
