On Sun, Dec 08, 2002 at 10:24:23PM -0500, Mike Burger wrote:
> Out of curiosity..I've been rejecting with a code of 550...what's the 
> difference between 550 and 553?

RFC 2821, s4.2.3:

      550 Requested action not taken: mailbox unavailable
         (e.g., mailbox not found, no access, or command rejected
         for policy reasons)
      551 User not local; please try <forward-path>
         (See section 3.4)
      552 Requested mail action aborted: exceeded storage allocation
      553 Requested action not taken: mailbox name not allowed
         (e.g., mailbox syntax incorrect)
      554 Transaction failed  (Or, in the case of a connection-opening
          response, "No SMTP service here")


So 550 is the better choice (access denied).

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