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RE: 4yz Temporary Rejections is part of the SMTP Protocol

2011-10-29 04:34:31

-----Original Message-----
From: SM [mailto:sm(_at_)resistor(_dot_)net]
Sent: Saturday, October 29, 2011 1:59 AM
To: Murray S. Kucherawy
Cc: ietf-smtp(_at_)imc(_dot_)org
Subject: RE: 4yz Temporary Rejections is part of the SMTP Protocol

John suggested a new reply code series, but that scares me a bit;
what would a staunch legacy implementation be likely to do with that?

The legacy implementation could ignore it.  In practice, it may cause
code path issues if there isn't any protocol negotiation.

A well-planned specification will presume the latter.

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