Whats the actual error message that you are getting?

Error Number: 5
Module Name: RunSingleSchedule
Line Number: 2321
Error Description: Destination Error: Judy Tasker

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Error Description: Single Schedule:4plus user listReport(s) produced successfully but email failed with the following error: 535 5.7.3 Authentication unsuccessful.

Error Number: 5
Error Source: SendSMTP
Error Line: 1480
Suggestion: Your SMTP server is not configured to use a username, password or both. Please remove the username and password and try again
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Suggestion:

Please log a support call (in CRD go to Help -> Support -> Technical Support) so that this issue can be properly resolved by the helpdesk.

thanks Les, I fixed it. I setup a SMTP server when I already had it in Options.