We're seeing things similar to this. A client calls us asking about a higher than usual bounce rate, our message from Outlook is that our IP address is on a block list. We fill in the Postmaster form asking to be delisted, then about half an hour later we get a response saying our IP range is completely fine...
On Fri, 25 Jul 2025 at 16:50, Stefan Neufeind via mailop <[email protected]> wrote: > Hi, > > I recently had conversation through various channels with Microsoft > regarding a blacklisting happening in Europe with their OLC (outlook > consumer) protection-gateway for a specific IP-address being blacklisted. > > First, let me stress that after finally having reached a right team the > Microsoft-support was very helpful and friendly. They helped resolve the > case in short time. > > It still frightens me to see how intransparent such blacklistings > happen. For good cooperation among ISPs we were in their JMRP program > (junk-mail reporting program) for a long time - but haven't received > feedback about this case. Using their support-forms for IP-delisting the > first automated response was that IP was not blacklisted at all - > although the SMTP-errors clearly showed that based on the IP a > blacklisting happened. > > Does someone know if there are multiple blacklists being used inside > Microsoft? Are there any chances to query blacklists to more easily/ > quickly learn about blacklistings that happen? Why is JMRP not used or > maybe only for certain recipients? And why do forms report there are no > active blacklistings - when after having reached a human through the > same way they confirmed the blacklisting was removed? > > > When asking again as a follow-up about how the blacklisting could have > better be detected and reported etc. to improve cooperation I got: > > > I do apologize, but I am unable to provide any details about this > > situation since we do not have the liberty to discuss the nature of > > the block. > > I don't blame the support person at all. They are not allowed to discuss > details. But why is there so little cooperation between large > mail-operators to mitigate problems, to proactively communicate (as was > the intention of the JMRP I guess) and to work closely when something > happens to stop any errors early instead of waiting for problems to > escalade? > > > Kind regards, > Stefan Neufeind > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop >
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