This tutorial will show you how to configure a new account for POP access (rather than IMAP).
1. Select Tools | Account Settings... | Account Actions | Add Mail Account .
2. Enter your username (check with your mail provider; it is your full email address) and password and click Continue.
3. Thunderbird will attempt to configure your accounts settings automatically using IMAP. Click Stop.
4. Enter your account details as follows:
5. Once these settings have been entered, click Manual Setup...
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You may get an error message that says that the SMTP account already exists. Clear the message.
6. Click on Cancel to exit the Account Settings dialog. Re-open the Account Settings page and you will see that your new account has been created. Also please check your Outgoing Server (SMTP) is correct for this account (at the bottom of the screenshot).
7. Check that your incoming and outgoing mail is working correctly. If everything is ok (i.e. you can send and receive email and see your old emails; note that some email providers may not give you access to all of your emails or all your email folders; check with your mail provider) and you accidentally created an IMAP account, then delete the accidentally created IMAP account as follows: open Tools | Account Settings..., select the accidentally created IMAP account with the IMAP server setting, then select Account Actions|Remove Account from the drop-down list underneath the account list on the left.