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

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
> > > persistent.
> > 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.

        hp

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