How to fix an error "A program is trying to send an e-mail message on your behalf. If this is unexpected, click Deny and verify your antivirus software is up-to-date." that occurs while using Send Outlook Mail Message activity?
This message is displayed when a program tries to access your Microsoft Outlook client to send an email message on your behalf, and the antivirus software is detected to be inactive or out-of-date.
To overcome the problem, follow the suggestions made in the Microsoft A Program Is Trying To Send An Email Message On Your Behalf .