This tutorial will show you the basic settings you need to send and receive emails in Thunderbird
To manually configure an account, you will need to have the following details which have been supplied to you by Mexxus.
Incoming mail server and port (for example, "mail.example.com" and port 143 or port 993)
Outgoing mail server and port (for example, "mail.example.com" and port 26)
Security setting for the connection with the server (for example, "SSL/TLS" and whether or not to use secure authentication – This is required to SMTP)
First, open the Account Settings: In the Thunderbird menu bar, click the Tools menu and select Account Settings, or click the Application menu button New Fx Menu and select Preferences and Account Settings from the sub-menu.
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.
At the bottom of the left pane, 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).
Then press Manual Configuration and edit the server names, ports and IMAP/POP to manually set up the the account. Click Re-test to test your manual settings; there should be a quick response indicating the settings are valid. If not, press the Stop button to abort the lookup, then edit the server names, ports and IMAP/POP and click Re-test again. (Alternatively, you can allow the lookup to gather default account details and then manually change the settings later.)
Configure the outgoing server
Multiple email accounts can use the same outgoing SMTP server. Therefore, SMTP servers are created separately from email accounts. In the Account Settings dialog, in the left pane, select Outgoing Server (SMTP) from the bottom of the list. There may be an entry in the resulting list that was created when you entered your account details. Either edit that entry or add a new entry.
After saving the information about the new outgoing server, select your new email account from the list. In the Outgoing Server (SMTP) field, select the SMTP server from the drop-down list. Other items on the page were automatically created when you entered the account details - alter and extend as necessary.
Click on the Server Settings option under your new account. Make sure the entries in the following fields correspond to the settings given to you by Mexxus.
After saving these changes you should be able to send and receive emails. Other aspects of account configuration are optional and self-explanatory.