I think that every MDA that adds Delivered-To checks to see of the message
already has the same D-T and if so drops or bounces the message.
MUST or SHOULD or MAY? Or non-normative?
Definitely not normative, just an observation about existing practice.
RFC 5321 says to count Received headers to break loops and I don't want to
get into updating that.
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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