[kwlug-disc] how to tell programmatically that mail was undeliverable?

[Paul Nijjar]

On Wed, Mar 31, 2010 at 09:30:06AM -0400, Robert P. J. Day wrote:
> 
> 
>   however, given a properly-configured mail server at the other end,
> is there some RFC-approved notification that is *required* to be sent
> back so that i can verify the situation with as little muss and fuss
> as possible?  thanks.

I don't know if it is required, but when troubleshooting mail server
problems I have seen 5.x.y codes indicating permanent errors.

http://www.ietf.org/rfc/rfc1893.txt

  

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