Microsoft is investigating Alternate On-line mail supply points inflicting “Server busy” errors and delays when receiving emails from exterior organizations.
In accordance with consumer experiences, the Alternate On-line issues began this morning, affecting Microsoft 365 clients worldwide, throughout the Americas, Europe, and Asia.
Microsoft confirmed the continuing points this morning, at 6 AM GMT+2, saying that “some customers might 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 influence, earlier than we start formulating a remediation plan,” the corporate added.
“Influence is restricted to some customers who’re served via the affected infrastructure.”
Extra data on these ongoing Alternate On-line points is offered below 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 may very well be linked to the misguided enforcement of IP handle anti-spam guidelines for affected clients.
“We have recognized {that a} current service replace, utilized to a bit of infrastructure answerable for implementing IP handle anti-spam guidelines, comprises a change which is inadvertently inflicting influence,” Microsoft stated.
This confirms consumer experiences saying that, in some circumstances, they’re seeing hundreds 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 or publicly verify the continuing investigation by way of its Microsoft 365 Standing account on Twitter.
This can be a creating story …