Clients are reporting delays (from only minutes, up to a few hours) in emails destined for Microsoft managed outlook.com addresses. This seems to stem from Monday’s Spamhaus RBL block (which was resolved then) since Microsoft uses them along with their own algorithms, so it may take a bit longer to resolve. We are working on this and will post updates as they happen.
UPDATE: Email is flowing normally again. There are no more delays. 2026-04-01 at 13:00 EDT

I am experiencing delivery delays to non-Outlook.com email addresses with many of my customers. I want to make sure you are aware this is a broader issue.
can you shoot the details into support so we can get a look under the hood here?