Hack: an in-elegant solution that one personally doesn't like, but that appears to work.
As to the retry interval, I feel a bit out of my depth on that one, and I guess it all depends on exactly WHY the 452 was thrown, but ... the implication seems to be that an immediate retry (maybe give it a few seconds?) would be the preferred way to handle it, maybe with some sort of exponential back-off? Aloha, Michael. -- Michael J Wise Microsoft Corporation| Spam Analysis "Your Spam Specimen Has Been Processed." Got the Junk Mail Reporting Tool<http://www.microsoft.com/en-us/download/details.aspx?id=18275> ? -----Original Message----- From: mailop [mailto:mailop-boun...@mailop.org] On Behalf Of Steve Atkins Sent: Wednesday, January 24, 2018 11:49 AM To: mailop@mailop.org Subject: Re: [mailop] Issues delivering to Hotmail addresses > On Jan 24, 2018, at 11:32 AM, Michael Wise via mailop > <mailop@mailop.org<mailto:mailop@mailop.org>> wrote: > > > Much internal discussion, but … > Apparently … > > “ 452 is a special error code (per RFC) that instructs the sending MTA to > retry the rejected recipients immediately. > “ it is designed to split messages with a large number of recipients. https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftools.wordtothewise.com%2Frfc%2F5321%23section-4.5.3.1.9&data=02%7C01%7Cmichael.wise%40microsoft.com%7C246f18f9638c4425e1c708d56364f4f5%7Cee3303d7fb734b0c8589bcd847f1c277%7C1%7C0%7C636524207624695015&sdata=bvELqPvQEBM35wzj7XjKoGvFnVR8cDJ5TMAVBc2Syzc%3D&reserved=0 Not exactly compliant, but I guess it's a reasonable hack. > Apparently that’s not exactly what we’re using it for, but there you go. > In theory, one or more of the recipients would deliver, and the first one to > a different region would get this response, and then the next try for the > remaining … should deliver. > Unless there’s more than two other zones, in which case it’s now an N-1 > problem, and … Lather, Rinse, Repeat until Done. Seems like it should work, in that a compliant sending MTA should retry with some deliveries potentially delayed. Should smarthosts be scheduling delivery attempts that get a 452 in response to RCPT TO for immediate retry, or is that a bit risky? Cheers, Steve _______________________________________________ mailop mailing list mailop@mailop.org<mailto:mailop@mailop.org> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fchilli.nosignal.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fmailop&data=02%7C01%7Cmichael.wise%40microsoft.com%7C246f18f9638c4425e1c708d56364f4f5%7Cee3303d7fb734b0c8589bcd847f1c277%7C1%7C0%7C636524207624695015&sdata=MmmEw0inMYK1CWrjDu7J2f2DzG3eGaeJ%2FJu42dXNAE0%3D&reserved=0
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