Do you have any email functions associated with registrations turned on? It may be that if you do, whether it is SMTP or sendmail, might be causing the problem.

If you do have email functions turned on, try turning them off and see if it resolves the problem. If so, then we've narrowed things down.

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Doug
darksaber.hispeed.com
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the Land of Mordor where the Shadows lie.