How resolve TFS 2018 no longer send emails notification

In this article I want to expose a problem (and a solution 🙂 ) that I encountered in my customer that use TFS 2018.2

The problem:

The client reported the following problem to me: since he upgrade from TFS 2018.0 to TFS 2018.2, he no longer receives all notifications emails that are sent either when a pull request is created, or when there is a change on a Work item on the “Assigned To” field. Sometimes users receive emails (but it’s rare) but in most cases emails are not sent.

Before this upgrade, sending emails by TFS worked very well.

My Investigation:

My investigation focused on different topics:

  • The configuration of the smtp server informations in the TFS Administration Console. In this side, the configuration is correct and has not been changed with the upgrade.
  • Investigate on the job agent history for  try to get  a raison of the failure:

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