SharePoint Foundation 2010, patched to Nov 2014 CU

I have two web applications in this farm. A workflow from web application 1 sends an email. One of the recipients of the email is a list in web application 2. Emails are never delivered to the list in web application 2.

In ULS I see this error message for the particular email: Errors occurred processing 1 message(s): Message ID:

The list in web application 2 receives the same email content without problem when sent directly from a user.

If I open the problem .eml in the drop folder I see the following header: Received: from mysharepointserver.mydomain.local (1xx.xxx.xxx.xxx) by myexchange.mydomain.local (1xx.xxx.xxx.xxx) with Microsoft SMTP Server id 8.3.342.0; Mon, 2 Feb 2015 13:09:44 -0700

There are other 'Received' headers in the .eml.

If I delete the header that references mysharepointserver.mydomain.local and save the .eml, SharePoint will process it accordingly.

I am led to believe that SharePoint will not process an email that it thinks was sent by itself, probably in an attempt to prevent a never ending chain of sent/received emails.

Can anyone confirm this? Is there a workaround?

Thank You!

  • Microsoft.SharePoint.Administration.SPEmailEngine checks the following email headers using string.Equals: "X-AlertServerType", "STS" and "X-Mailer", "Microsoft SharePoint Foundation 2010". If either are found it will not process the email.
    – Lou
    Feb 3, 2015 at 16:32

1 Answer 1


SharePoint cannot send email to itself:


If you can strip out the X-Mailer value, then you'll be golden.

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