I don't believe that. It's the prime responsibility of an MTA to retry on network failure. The sending MTA can't know the connection drop was deliberate. If it bounces mail because of one network error then the MTA is so useless as to befit those who use it.
True, but they're out there, and they're far more common than you think. Are you going to chop off your left arm because Microsoft (or whomever) can't get their code right?
Even if you're willing to do that, should everyone be forced to do the same?
We can also get a good sample of the message and then lose the connection, this is safe.
It's supposed to be safe, but it's not.
If the connection had already been accepted (and you had no control), then subverting it and handing back a 4xx response code would be the best thing to do. Just make sure that you don't 4xx the same message for too long a period of time, otherwise it would be inappropriately bounced. So, you might need some sort of scoring mechanism.
Yeah but this is before you get to peek at the message. Is it? Or can you receive the message (DATA) and THEN give a 4xx?
Yes, you can receive the message and issue a tempfail. Spammers will probably count this as a successful delivery (because they were able to transmit a copy of the message), but "real" mailers will hold onto the message until you finally decide to actually "accept" it.
-- Brad Knowles, <[EMAIL PROTECTED]>
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