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Email Forwarder: 1&1 Mail & Media Inc.


Known to originate email on behalf of other domains? no

Forwarding Characteristics

Preserves DKIM signatures? yes

Uses own domain in envelope (SPF)? yes

Notes on Forwarding

Preserves DKIM signed email when forwarding. 1&1 provides hosting for applications, so this source may be more than just a forwarder.


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.