At present messages forwarded utilizing the Easy Mail Switch Protocol (SMTP) or mailbox forwarding are rewritten in order that they arrive from the forwarding mailbox.
Nonetheless, Microsoft is at the moment engaged on a brand new e mail improve that may see messages which are autoforwarded (or redirected) in Workplace 365 rewritten utilizing the Sender Rewriting Scheme (SRS).
Sender Rewriting Scheme
This new SRS function rewrites the P1 From handle (also referred to as the Envelope From handle) for all relevant messages which are despatched externally from Workplace 365. On account of this transformation, deliverability of messages that go SPF checks once they arrive from the unique sender however then fail SPF on the last exterior vacation spot after they’re forwarded has been improved.
Nonetheless although, as a result of modifications in conduct, disruptions could happen. For example, forwarded messages will not be rewritten when despatched to a buyer’s on-premises servers.
Microsoft will start utilizing SRS to rewrite all messages forwarded utilizing SMTP or mailbox forwarding starting in October, so if you happen to’re forwarded emails do not arrive at their last vacation spot at the moment, this might be the explanation why.