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Symantec Email proxy rejection (intermittent) 1003,10

Created: 24 Oct 2011 • Updated: 24 Oct 2011 | 2 comments
This issue has been solved. See solution.

Would anyone know what my might cause this error to occur in MS Outlook (we are not running exchange, we use an external POP mail server with our ISP).  Not all users are getting this and the one who is getting it is not getting the message on every EMail.  But they are all running Symantec Endpoint Protection version 12.1.671.4971 as unmanaged clients.  There message box is attached.

Also, if this is the wrong community can someone tell me where I should try posting this inquiry?


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Thomas K's picture


Please see these two articles that address this issue. Let me know if you still have questions.

Many Unexpected Pop-Ups from Symantec Email Proxy are Displayed

Unexpected Pop-Ups from Symantec Email Proxy

Moving this thread to the Endpoint Protection forum for greater visibility.


MJFranek's picture

Well, changing the SMTP port setting to 587 got rid of the pop-up but the message still did not go out.  SInce we are considering changing ISP's I don't know if there is a point to involving them.  Thanks for the response.