Thank you for those who replied and made suggestions. I should have mentioned this before, but we're a German webhoster that specializes in dedicated servers. So the majority of our IPs belong to our customers who use them on their own dedicated servers. They're the ones having issues, since Microsoft has blacklisted large parts of our network. We ourselves don't have any issues sending emails to Microsoft accounts with our own mailservers.
That's why I posted here, since most of the information I can find online relates to issues with a handful of IPs, or a specific domain, or DKIM implementation or something along those lines. In this case, I'm talking about hundreds of thousands of IPs from our network being blacklisted by Microsoft. Thanks again for any tips. Bastiaan van den Berg Hetzner Online GmbH Am 17.11.2016 um 10:02 schrieb Franck Martin: > I would suggest you sign up for the JMRP, so you know what people are > complaining about... > > On Thu, Nov 17, 2016 at 12:46 AM, Angelo Giuffrida < > angelo.giuffr...@gmail.com> wrote: > >> Welcome to the fun game of Microsoft & Hotmail blocks. If you do a search >> through the list archives you'll find responses from Michael (and others) >> that will be helpful. That should provide you with some information to get >> started whilst you wait for others to reply. >> >> On Thu., 17 Nov. 2016 at 7:24 pm, Hetzner Blacklist Support < >> blackl...@hetzner.de> wrote: >> >>> Hello, >>> >>> We're currently having some major issues with our IPs being blacklisted >>> by Microsoft. I'm signed up for the SNDS and a huge amount of our IPs >>> are "blocked due to user complaints or other evidence of spamming". >>> >>> It's fairly easy to have the IPs delisted by filling out the "Sender >>> Information for Outlook.com Delivery" form that Microsoft provides. >>> However, that only allows up to a /24 to be delisted at a time, which >>> means it is going to take a very long time to delist all of our ranges. >>> >>> Also, that doesn't actually address the underlying issue. Obviously spam >>> isn't being sent from all of those IPs, but there has to be some reason >>> Microsoft is listing them all. >>> >>> Is this something anybody here has experienced? Better yet, is there >>> somebody from Microsoft who could have a quick look at this and give me >>> some insight into the underlying issue? I've been attempting to contact >>> Microsoft for a while now and only ever get canned responses (if at all). >>> >>> Any tips or help would be greatly appreciated, thanks. >>> >>> Kind regards >>> >>> Bastiaan van den Berg >>> >>> Hetzner Online GmbH >>> >>> _______________________________________________ >>> mailop mailing list >>> mailop@mailop.org >>> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >>> >> >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> >> > _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
