Mozilla Thunderbird is a free and open source email client developed by the Mozilla Foundation that can be downloaded at:
To configure Win2PDF to send using Mozilla Thunderbird, first open the "Configure Mail" from the Win2PDF Desktop file menu.
Win2PDF Configure Mail
You can also open "Configure Win2PDF Mail" from the Windows start menu under the "Win2PDF" program group. The following Window is displayed:
Win2PDF Mail Configure Thunderbird