- Open Thunderbird, select the Tools menu and from the drop-down list select Account Settings.
- From the Account Settings window, in the left-hand column, select Outgoing Server (SMTP) and from underneath the Outgoing Server (SMTP) Settings area of the window on the right, select Edit….
- In the SMTP Server window, enter 465 in the Port: field. Ensure you checkmark the Use name and password field then enter your Verizon user name in the User Name field, omitting the @verizon.net portion of your email address.
- Select SSL/TLS in the "Connection Security" dropdown.
- When you are finished, select OK.

