To be able to send SMS messages via e-mail (SMTP), you must first add your e-mail address to the authentication list in the WinSMS Client Zone.
To do this, log into the Client Zone
here and then click on "My Profile":
Click on the “Email to SMS” tab.
Click on the “Add Email Address” button.
Type in your e-mail address you are going to be sending messages from and click on “Send Security Code”
Click the "OK" button on the confirmation window that follows:
Find the e-mail with the security code that was sent to your e-mail address, enter the security code and click on "Add E-mail Address"
Click the "OK" button on the confirmation window that follows:
Click on the "OK" button at the bottom of the window and then click "OK" again in the confirmation window that pops up:
A pop-up box will confirm that your profile settings were updated. Click on "OK" to close the window:
Congratulations, you have now added your e-mail address to the authentication list in the WinSMS Client Zone.