> another change in the email admin best practices discussion. For a short
> while the network became clogged in bounce messages sent to both valid
> and invalid addresses. Some of the invalid addresses even triggered
> infinite loops of error messages. None of the servers I am familiar with
> send bounce messages reporting invalid addresses any more. Our own
> servers won't even tell us internally when they discard incoming
> messages. SPAM quarantine is a thing of the past.

Seems like there's another possible way to handle messages to invalid
addresses, though; the receiving SMTP server can simply reject the
"RCPT TO" command with a 5xx error. This avoids backscatter but also
lets well-behaved clients know that the destination address is
invalid. AFAIK this is how Rackspace Email works (if you don't have a
catch-all address configured).


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