That's a violation of RFC 821, etc. Of course, the expectation that the email won't be discarded inside the system is also not countenanced.
But making a decision on the fate of an email at END OF DATA is not something that massive mail systems do. All the decisions on that happen after the connection has ended. Wish it were otherwise, but when each edge box is expected to handle thousands of connections opened per second, it doesn't scale. Aloha, Michael. -- Sent from my Windows Phone ________________________________ From: Renaud Allard via mailop<mailto:mailop@mailop.org> Sent: 6/9/2016 2:10 AM To: mailop@mailop.org<mailto:mailop@mailop.org> Subject: Re: [mailop] Microsoft/Hotmail discards mails On 06/09/2016 10:25 AM, Paul Smith wrote: > The problem is there may be a few other users who get false positives in > that type of spam quite frequently, and suddenly they are losing > messages with no hope of redemption or even knowledge that it's > happening. Actually, what I do is that when a mail goes to the junk folder, the server gives a 5XX error message to the sender at the end of DATA phase. So the sender, if real, knows something happened to his mail and that it might not be read.
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