We recently saw that "S3150" on 3 IPs part of 3 larger netblocks. For all of them we opened a ticket and they "mitigated the IP": I tried collecting more info to no avail, of course :-( .
Weird thing is at least one of them has always been *green* on SNDS and had not abuse reports at all in the recent months. That IP is part of a 9IP shared pool, so sending the same emails of the other neighbour IPs and it is the only one that was blocked with that error. That IP was a low volume IP (200-400 daily email) and I randomly picked few emails from the days before the block and I have not been able to identify spammy emails. I asked in the ticket if they could give some hint about the issue as I can't find spammy emails, I didn't receive abuses and SNDS says everything was good before (and everything is still good for the twin IPs) but they simply mitigated and ignored my questions. So, +1 to your questions. Stefano On Tue, 11 May 2021 at 14:07, Benoit Panizzon via mailop <[email protected]> wrote: > > Dear List > > One of our main smtp outbound ip addresses is blocked by microsoft. > > host outlook-com.olc.protection.outlook.com[104.47.10.33] said: 550 5.7.1 > Unfortunately, messages from [157.161.12.84] weren't sent. Please > contact > your Internet service provider since part of their network is on our > block > list (S3150). You can also refer your provider to > http://mail.live.com/mail/troubleshooting.aspx#errors. > [DB5EUR03FT006.eop-EUR03.prod.protection.outlook.com] (in reply to MAIL > FROM command) > > I checked our JMRP entries. This IP is listed as one of our > mailservers. The complaint rate is < 0.1% but it had 2 'trap' hits and > is in status red. > > Our abuse desk email address is registered for the ARF feedback loop > for the ip range in question. > > We usually get a lot of feedback loop emails, mostly false positives of > Mirosoft users mixing up 'junk' with their trash folder or similar, or > moving all their old mail to 'junk' causing an avalanche of complaints > being sent. I opened several cases with Microsoft about this, but never > got any solution offered (as a sidenote rant) > > But no, there were no complaints about: 157.161.12.84 received. > > Does anyone know, how to get hold of the emails that caused this > blocking? > > Mit freundlichen Grüssen > > -Benoît Panizzon- -- Stefano Bagnara Apache James/jDKIM/jSPF VOXmail/Mosaico.io/VoidLabs _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
