Step 1 » From the Tools menu, select Options, then choose Account Settings.
Step 2 » From the Account Actions menu (bottom left), select Add Mail Account.
Step 3 » Enter your name, email address and password, then click Continue.
Step 4 » Thunderbird will attempt to configure your account. When prompted, click Manual Config to enter additional settings.
Step 5 » Type mail.invisibleink.com in the incoming server hostname field, then select SSL/TLS from the SSL drop-down menu. Authentication should be set to Normal Password.
Step 6 » Type mail.invisibleink.com in the outgoing server hostname field, then select STARTTLS from the SSL drop-down menu. Authentication should be set to Normal Password.
Step 7 » Enter your full email address for the username, then click Done to create your account.
Step 8 » Thunderbird will return to the Account Settings screen after successfully completing a test of your settings. Click OK to return to the Inbox.
Step 9 » Click Get Messages to sync your new mailbox with the server.