+1 On Wed, 11 Oct 2023 at 10:53, Kevin Kelker via mailop <[email protected]> wrote:
> Hi List, > > was about to write the same just when Andreas' mail popped up. > Also noticing an increasing amount of mails towards Microsoft getting > deferred with > 451 4.7.500 Server busy. Please try again later from [x.x.x.x]. (S77719) > > > We see this happening for different from-domains as well for different > sender-IPs since about 0300 UTC and have also reports > of other ISP having the same issue. We are using their SNDS and none of > the sender-IPs are flagged on their side. > > Maybe someone from MS could take a look into this as our queues are piling > up. > > Best > Kevin > > ------------------------------ > *Von:* mailop <[email protected]> im Auftrag von Andreas via > mailop <[email protected]> > *Gesendet:* Mittwoch, 11. Oktober 2023 11:12:39 > *An:* [email protected] > *Betreff:* [mailop] outlook.com 421 try again later S77719 > > > Hello all, > > since a few hours we have problems with sending to Microsoft. We get > hundreds of messages like in the subject with the reference to S77719. Also > colleagues from other companies in germany are seeing the same in their > logs. All mails that are blocked here are from Microsoft customers, but > they are redirected through our servers. > > Trying to unblock the IP e.g. via https://sender.office.com/ shows that > the IPs are not blocked. > > Anybody have any idea? > > Thanks a lot > Andreas > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop >
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