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Email Forwarder:


Known to originate email on behalf of other domains? no

Forwarding Characteristics

Preserves DKIM signatures? yes

Uses own domain in envelope (SPF)? no

Notes on Forwarding

Microsoft runs a complicated infrastructure, with email routing through and between various services on route to final delivery. For an overview from Microsoft on their forwarding challenges, see


When deploying DMARC, domain owners often find that email can flow through forwarders before arriving at a final destination.

Domain owners then wonder if the forwarder is capable of interoperating with DMARC.

This directory contains information on the capabilities of various email forwarders.