The first response is likely automated and is always something like that (no block or similar).
In my experience replying to the message with something like "escalate" will hopefully make it land in some human inbox. Regards, On Tue, Dec 30, 2025 at 7:34 AM Patrick van de Kuil via mailop < [email protected]> wrote: > From my experience MS is not transparent about these blocks at all. When > contacting them through https://olcsupport.office.com their initial > response will be there is no block at all. Well, that is what they keep > telling me when I contact them. > > They don't provide any details at all when you ask them. They either > unblock or keep the block active for undisclosed reasons. > > On 12/30/2025 1:38 AM CET Graeme Fowler (Admin) via mailop < > [email protected]> wrote: > > > It finally happened! The mailop list server has been blocked by Microsoft, > resulting in a slew of suspended subscriptions. > > The problem I have is that I simply can't reach the link they provide in > the error message: > > *Diagnostic-Code*: smtp; 550 5.7.1 Unfortunately, messages from [ > 91.132.147.157 > <https://appsuite-classic.open-xchange.com/appsuite/91.132.147.157>] > weren't sent. Please contact your Internet service provider since part of > their network is on our block list (S3150). You can also refer your > provider to http://mail.live.com/mail/troubleshooting.aspx#errors. > [Name=Protocol Filter Agent][AGT=PFA][MxId=11BC88DCCD3A3675] [ > BN3PEPF0000B06E.namprd21.prod.outlook.com > <https://appsuite-classic.open-xchange.com/appsuite/BN3PEPF0000B06E.namprd21.prod.outlook.com> > 2025-12-29T08:43:13.886Z 08DE446E687E5366] > > The link redirects 3 or 4 times to a page which gives a 500 internal > server error. This happens regardless of browser, OS, whether logged in to > an MS account or using private/incognito mode. > > In the absence of any other capability to address this with MS by > following their directions, subscribers using live/outlook/Hotmail > addresses should consider their subscriptions at risk. > > Graeme > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > -- -- Paulo Azevedo
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