When you enter settings on the Collabora Office - PreferencesTools - Options - Collabora Office Writer - Mail Merge E-mail tab page, you can click the Test Settings button to test your settings.
(Results list box)
In the top list box you will see the results of the test session.
Errors
In the Errors list box you can read an explanation of any errors encountered while testing the settings.
Stop
Click the Stop button to stop a test session manually.