I was in the process of creating a custom workflow which involved up to 3 users approving a form submission. For testing purposes, I had all 3 of these users set to myself. After ~2 weeks of working on the workflow, this afternoon I stopped receiving emails.

After investigating the Workflow Health, I found an Non-Delivery Report link to the following: enter image description here

I tried updating one of the emails to a Co-worker, but the email doesn't go through to them either. How can I resolve this and how can I not have it occur in the future?

  • can i lol to this ? – Mike Mar 28 '18 at 21:52
  • I know I was laughing when it happened xD – vanblart Mar 29 '18 at 12:30

We faced a similar issue today, all the O365 workflows (sending emails and tasks creation) suddenly stopped working showing the below mentioned error message

(Error: SmtpException while sending email: System.Net.Mail.SmtpException: Mailbox unavailable. Access denied, tenant has exceeded threshold.)

Our O365 administrator mentioned that 'Microsoft confirmed this is known Service Issue and the Product Group is already engaged and working on a solution'.

Currently our workflows started to work since the last half an hour but we are experiencing delays in workflow execution.

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Please check if you have end your workflow properly. It seems workflow is loops indefinite time and sends you email

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  • I've actually started receiving the emails again. I'm not sure what happened, but there was a weird period where it didn't want to send? – vanblart Mar 27 '18 at 19:22

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