I'd love to be able to drop them, but the situation is made in a way that we can not do anything: That user configured their bounce domain to pass through us, but we didn't send their bouncing email in the first place. they use another service for that.
As long as they point their bounce domain to us, we will receive this amount of emails back. The only things possible to stop this is either to block this user from sending any more emails (we aren't the senders, so we don't have any leverage here) or to change the MX of their domain to something else (and we don't own their domain). That's why we are desperately trying to find a solution. In the meantime, we are in discussion - with the service that this user is using to send emails - to see with them how we can mitigate this, hopefully make this client stop using our MX. Since it's impossible to just stop that flux of incoming connections, I was hoping you had some other ideas to avoid this, hence my original email. Thank you for your message and your help :) Le mer. 23 nov. 2022 à 13:31, Peter N. M. Hansteen <pe...@bsdly.net> a écrit : > > > On 11/23/22 10:39, Cyril - ImprovMX via mailop wrote: > > > I forgot to mention this, but indeed, the first thing we did was contact > > them. We had no response, so we blocked them and later realized that the > > email contact we had was a black hole on their end, so we reached out > > using another email we found and got a response. They are looking into > > it, but I still wonder how we can have what is now 70k connections per > > minute solely from Outlook. > > I think you have just described a textbook example of a customer that > needs to be dropped, urgently. > > Your initial description was vague enough that it was almost possible > that they were just clueless, but their giving you bad contact info > rules that out. They are *bad actors*, and should be treated accordingly. > > If you can extract compensation for the damage they have done, that > would be a good thing. > > If you keep them on as customers, your own reputation will suffer and > you will likely lose business over this matter. > > Please, do the right thing. LART them to the maximum extent possible if > you can, but stop providing any kind of service to them. > > All the best, > Peter > > -- > Peter N. M. Hansteen, member of the first RFC 1149 implementation team > http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/ > "Remember to set the evil bit on all malicious network traffic" > delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds. >
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