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SMTP 551 code in use?

2003-03-24 07:02:26


when I (acting as SMTP client) send rcpt to and receive a 551 code from a server, it might be a good idea to use the referenced e-mail address instread of the one I used. Final decision left to the user, of course.

However, I can't find any formal grammar for the text supplied by 551. Is there one? Can I expect server implementations to conform to this well-hidden grammar (assuming there are server implementations that return 551 at all)?


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