SMTP IPv6 to IPv4 Fallback: An Applicability Statement

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Last updated 2014-11-16 (latest revision 2014-05-15)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This Applicability Statement describes how Mail Transfer Agents (MTAs) can be encouraged to fall back to IPv4 when a message is refused over IPv6.


Franck Martin (
Alec Peterson (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)