Hi Laura > In my experience, when the bounce message says "Please contact your Internet > service provider since part of their network is on our block list (S3150).” > That means that Microsoft is seeing problems across a wide range of IPs in a > space and they don’t have a clear picture of where the customer boundaries > are. You may find a better customer experience if you SWIP IPs to your > customers rather than just lumping them all into a single /16. > > Are these the IPs you’re using for forwarding? If so, how much filtering are > you doing before you forward them?
157.161.0.0/16 is a 'legacy', pre RIPE range which is exempt from the RIPE requirement to register customer allocations. So for privacy reasons we have decided not to register our customers using this ranges @ RIPE. Anyway we mostly have businesses customers in this range. Whole of 157.161.0.0/16 is included in the SNDS monitoring. I don't see any major problem there. We haven a customer running an ESP service, but also in his ip range, the complaint rate is < 0.1% Out of this range, our email platform uses 157.161.12.0/23 It's a typical 'end user' platform for our enduser internet access customers. Webmail, IMAP Mailboxes. We also operate whitelabel email services for other ISP. Each one with it's own dedicated ip range. We explicitly do not offer 'relaying services' to customers with own mailserver. Our rate limiting thresholds would not make those customers happy. As we quite closely monitor those services, I am pretty confident we have no major problem. Of course we get the occasional customer which manages to get his credentials phished or stolen and the account then abused. But usually it's a matter of minutes for some measures to automatically block such account, maxium 2 days, if some human intervention is needed until such an account is blocked. And yes, I did open a case with the SNDS support team. But usually when we hit a blacklist with one of those IP, we already know why. Mit freundlichen Grüssen -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________ _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
