I can confirm this has now been resolved and mail flow has returned to normal.
User Impact: Users may experience delays when sending or receiving email messages in Exchange Online.
More info: Users may see the message status being stuck on 'Pending' or 'Getting Status'.
Current status: We're analyzing service telemetry information to determine the next troubleshooting steps.
Users may experience delays when sending or receiving email messages in Exchange Online. We will post any further updates as we get them from Microsoft.
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