We use Thunderbird as our e-mail client on multiple computers. We also have multiple e-mail providers. On one of our computers we can receive but not send in one of the verizon.net e-mails configured in Thunderbird. All of the critical outgoing settings, are the same except for the e-mail address, Description: Verizon Online, Sever Name smtp.verizon.net, Port 465 Connection Security Normal Password, user name different for each account. I have looked around on the Web and not found any solutions that worked. Thanks very much.