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

2011-10-29 03:04:14
On 2011-10-28 22:02:48 -0400, Hector Santos wrote:
John C Klensin wrote:
I considered this and even a special extended status code but
stopped because the key part of the SMTP extension is parsing
the response text, which as far I am aware of, there are no
known SMTP practice to do so (outside of proprietary or
localized) due to the idea we can't rely on it to be

I'm not sure what you mean.  Certainly the responses to VRFY and
EXPN have to be parsed and 5321 is moderately specific about
their syntax. ...

Ah yes. Forgot about these and of course, others like AUTH, CHUNKING
are SMTP extension examples of *structured* response text parsing for  
client/server negotiated concepts.

Don't forget EHLO. The client has to parse the response to know which
extensions are available.

And then there are the 251 and 551 replies although I don't know any
client which can use them.


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