In History, is the schedule marked as executing once, or multiple times?
If it is executing once, then the problem is with the SMTP server. Try using a different SMTP server (say and ISP) and test to see if it makes a difference.
Let us know how things go.
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Replying to:
I set up the demo download and have schedules e-mail via SMTP. Ever time an schedule is execute the recipients get multiple copies ( 2 or 3). Why is this ?