Mozilla Thunderbird

Launch Thunderbird.
First, open the Account Settings (Tools | Account Settings).
Each email or newsgroup account that has already been configured is listed on the left side of the Account Settings dialog. These accounts correspond to the top-level folders displayed in the All Folders list.
From the File menu, select New, and then choose Account. The Account Wizard will open up.
Click the Account Actions button and select Add Mail Account.

Enter your email account details and press Continue.
Thunderbird will try to determine your account settings based on the domain portion of your email address (that is, the portion after the "@" symbol).

Press the Stop button to abort the lookup, then edit the server names, port, encryption and server type, and then press Manual Configuration to manually set up the the account.

Select either IMAP or POP3 for the server type depending on which you wish to use.

Note that it's important that you set server names, port and IMAP/POP before clicking Manual Config.

We now need to check that the outgoing (SMTP) settings are correct.

Go to the Tools menu and select Account Settings.
Choose Outgoing Server (SMTP) from the left hand list.
Ensure that the SMTP server details are set to
Server Name is mx1.3legs.com , and that Username and password is ticked (your username is your full email address).