Microsoft 365 user cannot send messages, can receive fine
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single user from our M365 users said his emails weren't being received. He was receiving emails though, without any problems. No other users reporting issues.
I checked Mail Flow report and nothing in his Outlook sent was showing but messages are in user's Outlook Sent Items.
Asked user to use OWA as thought it was Outlook, but same issue, however in OWA items are NOT showing up in Sent Items.
Both emails within our org and emails outside our org are not sending (and in OWA not appearing in sent items folder even when sending from OWA)
Checked Threat management > Review > Restricted users and user account is not in there.
Checked Rules and no malicious rules are present.
Not getting any NDR messages.
Checked Mimecast and mesages dont' appear to be held up there.
Not sure where else to look?
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Is this a
one-to-manyissue or aone-to-oneissue? IE Can this person email you? -
both they can't email just me, can't email inside the tenant or outside the tenant. Can't email individuals or groups. I haven't had them try mobile yet so that's an avenue Im pursuing now
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@jt1001001 Have you checked the O365 -> Admin -> Exchange -> Mail Flow? Searching for his email address within that tool will tell you if the O365 mail servers think messages are being delivered.
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Checked mail flow and nothing for the user in question since 8 am local time today. User has sent messages since but none have arrived (and are seen in their Sent Items folder in Outlook client). Test Messages they sent from OWA also not appearing in message trace.
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Follow up, the OWA sent messages appear in the drafts folder on OWA with the following at the top:
"We're still sending your message. Please check again in a couple of minutes" -
@jt1001001 said in Microsoft 365 user cannot send messages, can receive fine:
Follow up, the OWA sent messages appear in the drafts folder on OWA with the following at the top:
"We're still sending your message. Please check again in a couple of minutes"Seems like an O365 relay delay.
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Have you checked Azure AD logs or the account for any strange activity?
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I am also not seeing any Advisories of Office 365 Delays across multiple tenants.
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I opened a ticket with Microsoft as there were no advisories. Messages just now started flowing and Microsoft stated they had a few reports of this.
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oh crap - I hope this isn't a SAM issue - he had some wacko problem with his O365 account years ago... everyone else was fine, but SAM, nope, broken....
not sure MS ever fixed it. -
I remember that and Im hoping it is not a zombie issue
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@jt1001001 We have seen some accounts just stop sending because they implemented a new rule that blocks automatic forwarding or they supposedly suspected spam emails. So We had one of those two weeks ago.
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@dbeato Good to know thanks! and thanks all for the suggestions/assistance on where to look.
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This was what Microsoft sent me as "resolution"
