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Some links on SMTP tar-pit to lessen SPAM

Posted by jpluimers on 2021/11/03

Some links for my archive; note that pure tar-pits by now are also hampering large email sender services like SendGrid, Mailgun and Amazon SES.

So the below links are for educational and historic purposes only.

I assembled these links because out of a sudden, Ring 2FA verification emails could not be delivered any more.

Ring 2FA came mandatory towards the end of February 2020.

Some links on that:

Sendmail timeouts:

–jeroen


2020-03-31T10:08:34.402372+02:00 snap sendmail[29592]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:10:05.550572+02:00 snap sendmail[30013]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:10:34.521709+02:00 snap sendmail[29592]: 02V88YAS029592: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:12:05.673585+02:00 snap sendmail[30013]: 02V8A5RQ030013: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:12:10.479557+02:00 snap sendmail[30057]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:13:31.911468+02:00 snap sendmail[30544]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T10:14:10.599326+02:00 snap sendmail[30057]: 02V8CAu4030057: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:14:40.481324+02:00 snap sendmail[30547]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:15:05.916150+02:00 snap sendmail[30549]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T10:15:32.033826+02:00 snap sendmail[30544]: 02V8DVFZ030544: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:16:40.604351+02:00 snap sendmail[30547]: 02V8EeRr030547: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:17:06.033592+02:00 snap sendmail[30549]: 02V8F5ZY030549: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:17:10.891192+02:00 snap sendmail[30595]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:17:40.447080+02:00 snap sendmail[30603]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:19:11.012476+02:00 snap sendmail[30595]: 02V8HAXM030595: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:19:40.569264+02:00 snap sendmail[30603]: 02V8Heh3030603: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:19:40.987599+02:00 snap sendmail[31105]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:21:08.069249+02:00 snap sendmail[31108]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:21:41.113096+02:00 snap sendmail[31105]: 02V8JeiK031105: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:22:40.174575+02:00 snap sendmail[31136]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:22:40.426572+02:00 snap sendmail[31137]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:22:40.919578+02:00 snap sendmail[31138]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:23:08.186602+02:00 snap sendmail[31108]: 02V8L8o4031108: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:24:40.295996+02:00 snap sendmail[31136]: 02V8Me0L031136: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:24:40.553121+02:00 snap sendmail[31137]: 02V8MeoI031137: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:24:41.042658+02:00 snap sendmail[31138]: 02V8MeN5031138: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:24:45.154333+02:00 snap sendmail[31622]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:26:45.275350+02:00 snap sendmail[31622]: 02V8OjB4031622: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:27:20.172571+02:00 snap sendmail[31643]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T10:27:40.905307+02:00 snap sendmail[31646]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:29:20.297002+02:00 snap sendmail[31643]: 02V8RKtX031643: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:29:41.026274+02:00 snap sendmail[31646]: 02V8Rea4031646: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:30:25.152770+02:00 snap sendmail[32193]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T10:32:00.519601+02:00 snap sendmail[32200]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T10:32:25.265366+02:00 snap sendmail[32193]: 02V8UPaR032193: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:34:00.646026+02:00 snap sendmail[32200]: 02V8W0ev032200: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:35:30.172349+02:00 snap sendmail[32716]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:37:00.906561+02:00 snap sendmail[32741]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T10:37:30.286290+02:00 snap sendmail[32716]: 02V8ZUQt032716: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:39:01.029903+02:00 snap sendmail[32741]: 02V8b084032741: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:44:55.825852+02:00 snap sendmail[1305]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T10:46:55.945400+02:00 snap sendmail[1305]: 02V8itAF001305: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:48:00.506257+02:00 snap sendmail[1337]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T10:50:00.627510+02:00 snap sendmail[1337]: 02V8m0vd001337: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T10:53:01.158286+02:00 snap sendmail[1886]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T10:55:01.291552+02:00 snap sendmail[1886]: 02V8r1Eg001886: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T11:01:02.131569+02:00 snap sendmail[3020]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T11:03:02.245406+02:00 snap sendmail[3020]: 02V912kf003020: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T11:19:00.525396+02:00 snap sendmail[5045]: NOQUEUE: connect from o7.sg.account.ring.com [149.72.233.225]
2020-03-31T11:21:00.650971+02:00 snap sendmail[5045]: 02V9J0Tm005045: o7.sg.account.ring.com [149.72.233.225] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
2020-03-31T11:24:01.416265+02:00 snap sendmail[5594]: NOQUEUE: connect from o6.sg.account.ring.com [198.21.6.126]
2020-03-31T11:26:01.530327+02:00 snap sendmail[5594]: 02V9O1bx005594: o6.sg.account.ring.com [198.21.6.126] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

view raw

ring.smtp.log

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