Hi Rauf, Yes, we observed the same things at our end. One of our customer account got compromised which causes some spam through our system that impacted the whole n/w from the same IP space though other IP's are dedicated and carry a good reputation at SNDS.
We tried to reach out to the support team with multiple tickets but could get expected responses apart from standard response. Not sure why whole n/w blocked when only specific IP's send spam due to compromised account. On Fri, Sep 11, 2020 at 11:22 PM Adam Moffett via mailop <mailop@mailop.org> wrote: > I have fought this battle before, and in my case it turned out to be a > compromised user account. Check logs for a sender with unusually high > volume. While you're waiting for the response to your ticket you can use > your time to hunt for that underlying problem. I do wish they provided > samples of the offender's messages, as that would remove any doubt and make > it much easier to see where the problem is. > > They also may not unblock you for some period of time after the activity > stops. I have had it take days. > > > > ------ Original Message ------ > From: "Rauf Guliyev via mailop" <mailop@mailop.org> > To: mailop@mailop.org > Sent: 9/9/2020 5:58:52 PM > Subject: [mailop] Anybody seeing a huge spike of (S3140) errors from > Hotmail/Outlook started on Sep 7th > > Hello there, > > We are seeing a huge spike in "550 5.7.1 Unfortunately, messages from [ > IP.AD.DR.ES] weren't sent. Please contact your Internet service provider > since part of their network is on our block list (S3140)" errors while > sending to Hotmail/Outlook. It started on Sep 7th and is affecting only one > datacenter, the rest is sending the same emails just fine. The SNDS shows > the affected IPs as green. Filed a ticket (SR1508383241) but curious to see > if it's widespread. > > Thanks in advance, > Rauf > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >
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