>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 >
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