Below is a description , how to configure The Bat 1.39 for SMTP AUTH support.

First, Select the position "Properties" in the menu "Account"

Then, a window will appear:

Click on the "Transport" Field on the left. The Right side of the window will look like on the picture above.

Click on the "More" button.

Another window will appear:

Select "Perform SMTP Authentication (RFC 2554) option.

Now you have to decide if you want to use the same login/password that you are using for POP server (choose "Use POP server Login" or if you want to use another pair, then choose "Use specific Login" and fill the Account and Password fields.

Click on "OK" , the window will close , click on the "OK button" in the Preferences window and now you have working SMTP AUTH support.