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Delayed email to Microsoft

Degraded

Reported Feb 23, 2026 at 8:52 PM UTC

Affected Systems

zmta
SMTP

We are seeing delayed outbound email to Microsoft (outlook, hotmail, etc). This appears to be a problem with their systems, though they are reporting it as this: "The mail server has been temporarily rate limited due to IP reputation." That said, no one works as hard as we do to combat outbound spam, and their complaint rates are very low. Our position, until we hear otherwise from them, is that this is an error in their system.

Updates

Investigating Feb 23, 2026 at 9:40 PM UTC

Second report came in, this is definitely not just us.

Investigating Feb 23, 2026 at 9:18 PM UTC

We've received 1 response indicating that we are not the only ones who started seeing this today.

Investigating Feb 23, 2026 at 8:52 PM UTC

We are seeing delayed outbound email to Microsoft (outlook, hotmail, etc). This appears to be a problem with their systems, though they are reporting it as this: "The mail server has been temporarily rate limited due to IP reputation." That said, no one works as hard as we do to combat outbound spam, and their complaint rates are very low. Our position, until we hear otherwise from them, is that this is an error in their system.