Hi,
here in Italy, we (Qboxmail) and other ISPs are having the same problem.
We're getting errors:
451 4.7.500 Server busy
with codes:
S77714
S77717
S77719
The problem started at 9:47 CEST on all our IPs at once.
Microsoft reports an incident (Delays or failures when sending or
receiving email messages) that has been resolved, but apparently not
completely:
https://admin.microsoft.com/Adminportal/Home#/servicehealth/history/:/alerts/EX1464935
It seems that messages are still arriving from US-based ISPs.
We've filed reports with Microsoft, but for now, the problem persists.
Any suggestions?
Il 04/09/2026 11:31, lukn via mailop ha scritto:
Hello Mailops
A few hours ago Microsoft suddenly started to drastically rate limit
all our servers with the following message:
> 451 4.7.500 Server busy. Please try again later from [x.x.x.x]. (S7
7719)
Is anyone else affected? Problem on their or our side? (Downdetector
for some European countries hints towards Redmond...)
Best regards
lukn
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--
Alessio Cecchi
postmaster AT qboxmail
https://it.linkedin.com/in/alessice
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