TO SEND AND RECEIVE EMAIL OVER SSL IN MOZILLA THUNDERBIRD (IMAP)
Thunderbird is a free application any customers using an older version than 17, we suggest you upgrade direct from Mozilla - http://www.mozilla.org/en-US/thunderbird/ as the info below is specific to Thunderbird 17 or higher
Start Mozilla Thunderbird, select Applications Menu » Options » Account Settings
Select Outgoing Server (SMTP) then highlight the account you want to change the outgoing server for and click Edit.
Change the Port to 465 and click OK
Click Server Settings under the mailbox you want to use for sending mail over SSL change the port to 993, amend the connection security to SSL/TLS and click on OK