O365 - Finding blocked/rejected messages?

[Steve21]

Morning All

 

Is there any way to find messages that are being blocked/delayed etc? Apparently some haven't arrived from external companies, but can't see anywhere that would let me find out why, or what the message is. Would be lot easier to do some testing if I see where it would be from

 

Thanks,

Steve

[JRowley]

They may have been caught in the quarantine. Go to the O365 Admin Dashboard, Exchange admin center, protection, quarantine.