Microsoft is investigating Alternate On-line mail supply points inflicting “Server busy” errors and delays when receiving emails from outdoors organizations.
In keeping with consumer stories on-line, the Alternate On-line issues began this morning, affecting Microsoft 365 clients worldwide, throughout the Americas, Europe, and Asia.
Microsoft confirmed the continued points this morning, at 6 AM GMT+2, saying that “some customers could encounter delays receiving exterior e-mail messages in Alternate On-line. Affected customers might even see a ‘451 4.7.500 Server busy’ error message.”
“We’re analyzing pattern throttling IPs from easy messages to substantiate whether or not the problem with the portion of SOL infrastructure is inflicting impression, earlier than we start formulating a remediation plan,” the corporate added.
“Influence is particular to some customers who’re served via the affected infrastructure.”
Extra info on these ongoing Alternate On-line points is obtainable beneath EX680695 within the Microsoft 365 admin heart.
Linked to IP-address anti-spam guidelines
In a subsequent replace, Redmond stated the reason for the problems could possibly be linked to the faulty enforcement of IP tackle anti-spam guidelines for affected clients.
“We have recognized {that a} latest service replace, utilized to a piece of infrastructure liable for imposing IP tackle anti-spam guidelines, accommodates a change which is inadvertently inflicting impression,” Microsoft stated.
This confirms consumer stories saying that, in some circumstances, they’re seeing 1000’s of emails added to the outbound queue due to Alternate On-line’s spam filter.
Microsoft has but to substantiate the areas affected by this Alternate On-line outage and if it additionally impacts Alternate On-line outgoing mail supply.
At this time’s incident follows a number of Alternate On-line outages because the begin of the 12 months, blocking clients worldwide from accessing their mailboxes and sending or receiving emails.
It is a growing story …
