Re: [PHP] tracking Mials Which were bounced.

mike wrote:
> Seems like the general way is to create a mailbox (POP3 or IMAP) to
> accept the bounces, then check it periodically and mark the emails as
> invalid in your local database.
> 
> I would set threshholds so you don't mark something failed that only
> bounced once - it could have been a mail setup error or something
> else; I'd say wait for 3 failures in a 7 day period at least. If you
> get 3 bounces by that point, the address is probably safely dead.
> 
> You can use PHP's IMAP functions to check the mailbox (even for POP3)
> or a million classes or your own functions directly on the socket
> (POP3 is a simple protocol) - it also helps if you parse the bounced
> email message to process the return address and the mail code; perhaps
> build something better than just 3 failures = invalid, but actually
> determine if they're full out failures, or if they're just temporary
> bounces, etc.

I use this method and it works reasonably well. The hard part is the
last sentence - there are so many ways to say "mailbox full" - half
don't include smtp error codes, the rest tell you the same thing in
thousands of different ways.

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