I am absolutely sure our custom workflows fires only one time but sends multiple duplicate emails every 1 minute (exactly every 60 seconds, i saw it from exchange logs).

Which is the timer job that trigger this mechanism?

I suspect is running multiple times, one for each farm servers.

The closest thing i found to my problem is: https://blogs.msdn.microsoft.com/besidethepoint/2011/11/13/sharepoint-timer-job-locks-and-scope/


  • How did you design your custom workflow? Is it a SharePoint Designer workflow? please provide a screenshot about your workflow structure to analysis further.
    – Kally
    Commented Dec 4, 2019 at 2:32

1 Answer 1


Could it be the Sharepoint Timer Service? This post might help.

The Windows Task Scheduler can also be used to configure the start conditions to run powershell scripts - for instance I've used this to trigger a Designer workflow that sends out an email reminder if the Reminder Date = Today's Date. If you have something like this set up, but mis-configured then it could trigger multiple emails...(I'm just trying to suggest another avenue of investigation).

Further Info on Timer Jobs

Link 1

Link 2

Or do an internet search on "sharepoint 2013 configure timer job in central administration" and you should find something useful.

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