Just to close the loop (and a comment): My search of mailop archives was my own personal copy, which is far from complete, so that’s why my search didn’t find it.
Also, apparently another tactic is. . . wait. I got my Microsoft SNDS account set up and everything, and promptly got busy with Life(tm). Got a note from MS that my automated access link was going to expire (it’s almost been a month). So went to do the whole form again, but. . . decided to do a test. And it went through. I don’t know if just setting up the SNDS access did something, but that is all I did. Anyway, I got nuthin’. The first I found the problem was 7/21, and 8/28 it’s all working. ¯\_(ツ)_/¯ Sean > On Jul 28, 2026, at 00:19, Simon Wilson via mailop <[email protected]> wrote: > > In my experience as another low-volume sender who has run into S3140s (I have > posted here about it, not sure why your mailop search didn't find it). > Submitting the form, following up, doing anything at all over 10 weeks got me > no response or change. I ended up routing emails to MS addresses via another > host. Then a couple of months later it unblocked, so I have this week > reverted but put in place a log monitor to check for if it happens again. > > YMMV, but I wouldn't put any value in the form or the process behind it. > > Simon > > > On Tuesday, July 21, 2026 18:07 AEST, Sean Kamath via mailop > <[email protected]> wrote: > >> Hello all, >> >> I’m a super low volume sender (basically, family only) and today I emailed >> someone at hotmail and got: >> >> > <redacted>@hotmail.com: 550 5.7.1 Unfortunately, messages from >> > [45.32.136.82] weren't sent. Please contact your Internet service provider >> > since part of their network is on our block list (S3140). You can also >> > refer your provider to >> > http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol >> > Filter Agent][AGT=PFA][MxId=11BDC63846E9567C] >> > [AMS0EPF000001B7.eurprd05.prod.outlook.com 2026-07-21T07:15:41.759Z >> > 08DEE31C291DD028] >> >> Searching my mailop archives for S3140 only finds one hit (from Michael Wise >> in 2022). From Michael Wise’s signature, and also the link on >> https://substrate.office.com/ip-domain-management-snds/Postmaster/Troubleshooting >> (followed from the link in the above rejection message) the form to use is >> http://go.microsoft.com/fwlink/?LinkID=614866 >> >> I see other messages that shows the form to use is at >> https://olcsupport.office.com/, but I think that is for S3150 (perhaps a >> different product group?). >> >> Either one requires me to log in with a Microsoft account. Is there a form I >> can use that doesn’t require a login, or should I just make one so I can >> fill out the form? >> >> Thanks, >> Sean >> _______________________________________________ >> mailop mailing list >> [email protected] >> https://list.mailop.org/listinfo/mailop >> >> > > > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop
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