Re: [mailop] Anyone else seeing email backed up to Microsoft -- only IPv6
On Thu, Oct 27, 2022, Peter Beckman via mailop wrote: > Deferred: 451 4.7.500 Server busy. Please try again later from > [2a01:111:e400:7e0d::51]. (AS750) Doesn't the MTA (which one do you use?) also try IPv4 or were there no A records at all? Do you still have the results for the MX and A/ lookups when the problem happened? TIA. -- Please don't Cc: me, use only the list for replies. ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
[mailop] Anyone else seeing email backed up to Microsoft -- only IPv6
I'm late to the party. Had the same issue. tl;dr -- Microsoft removed the IPv6 record around 8:09pm US EDT (00:09 UTC) and all of our backed up email is now delivered successfully. Long story: We've been delivering to hotmail for years, and I've got logs going back to May 29, 2022. Microsoft added IPv6 records likely around Oct 24, 2022 at 21:06:13 UTC, as prior to that email, everything was IPv4 in the logs. Everything was fine between 21:06:13 and 22:00:57, when, after 9 emails had been successfully delivered, after almost 700,000 between May 29, 2022 and Oct 24, 2022 were delivered without issue via IPv4, we received the dreaded Deferred: 451 4.7.500 Server busy. Please try again later from [2a01:111:e400:7e0d::51]. (AS750) [HE1EUR04FT020.eop-eur04.prod.protection.outlook.com] As Frank privately pointed out to me, some emails were delivered via IPv6, 389 to be exact, but many more were not, with a handful of emails still being rejected from Oct 24 still today! 8 Oct 24 71 Oct 25 80 Oct 26 222 Oct 27 And after the IPv6 was removed, we delivered 1,178 emails in about 2-3 minutes. So while the immediate outage is resolved, I'm not looking forward to the next time this happens. Cheers Beckman, new subscriber because of this --- Peter Beckman Internet Guy beck...@angryox.comhttps://www.angryox.com/ --- ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
Re: [mailop] Anyone else seeing email backed up to Microsoft -- only IPv6
On 25/10/2022 17.40, Frank Bulk via mailop wrote: We had it last night, too, but this morning seeing it again for hotmail.com, outlook.com, and live.com: Same here, with also the country-specific hotmail/live domains and msn.com (hardly surprisingly, as they are on the same servers). My temporary solution is to hardwire these for IPv4 delivery, which nicely cleared our queues. This does not scale. Unfortunately sendmail doesn't seem to have anything to do this on a permanent basis (ref: Claus Aßmann on comp.mail.sendmail), I'd be fine with IPv4 outgoing IPv4/IPv6 incoming. Also, Google seems to now be responding to a similar situation with a dsn=5.0.0 answer. How nice of them. -- /* * * Otto J. Makela * * * * * * * * * */ /* Phone: +358 40 765 5772, ICBM: N 60 10' E 24 55' */ /* Mail: Mechelininkatu 26 B 27, FI-00100 Helsinki */ /* * * Computers Rule 0100 01001011 * * * * * * */ ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
Re: [mailop] Anyone else seeing email backed up to Microsoft -- only IPv6
On 2022-10-25 18:56, Andreas S. Kerber via mailop wrote: @hotmail.com>, delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=41706, relay=hotmail-com.olc.protection.outlook.com. [IPv6:2a01:111:f400:7e8a:0:0:0:33], dsn=4.7.500, reply=451 4.7.500 Server busy. Please try again later from [2a01:111:e400:7e8f::47]. (AS750) [BN7NAM10FT103.eop-nam10.prod.protection.outlook.com] Quite a lot of mail queuing up already. Anybody know what's going on over there? As far as I can tell it's just some form of greylisting, but with a bad message. I have ~800 mails in queue for MS with the "Server busy" message and the oldest one is from ~40m ago. Older than that is all delivered. -- BR/Mvh. Dan Malm, Systems Engineer, One.com OpenPGP_0x328258BA5141B0F4.asc Description: OpenPGP public key OpenPGP_signature Description: OpenPGP digital signature ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
