On 06/09/2016 03:34 PM, Michael Wise via mailop wrote: > That's a violation of RFC 821, etc.
It might be, but it's the conservative (less scalable) approach instead of the aggressive one. There are RFC5321 violations everywhere like this one ;) RFC5321 4.5.3.2. Timeouts 4.5.3.2.7. Server Timeout: 5 Minutes. An SMTP server SHOULD have a timeout of at least 5 minutes while it is awaiting the next command from the sender. $ time telnet mx1.hotmail.com 25 Trying 65.55.33.119... Connected to mx1.hotmail.com. Escape character is '^]'. 220 COL004-MC5F4.hotmail.com Sending unsolicited commercial or bulk e-mail to Microsoft's computer network is prohibited. Other restrictions are found at http://privacy.microsoft.com/en-us/anti-spam.mspx. Thu, 9 Jun 2016 07:26:53 -0700 Connection closed by foreign host. 1m03.66s real 0m00.00s user 0m00.01s system > 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. > > > > > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >
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