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Manually Set Up E-mail with Mozilla Thunderbird for PC

Synchronise your 1&1 Mail Basic account with Mozilla Thunderbird on your PC using the IMAP protocol.

With IMAP, you can receive and send your e-mail everywhere regardless of your device and your location.

Step 1
Launch Mozilla Thunderbird. If it is your first time launching Mozilla Thunderbird, the Mail Account Setup Wizard should appear, and you may skip to step 4. Otherwise, continue with the next step.
Step 2
From the Mozilla Thunderbird window, select Tools > Account Settings.
Please note:
Press the ALT key if you do not see the menu bar with the Tools menu.
Mozilla Thunderbird Tools Menu
Mozilla Thunderbird Tools Menu
Step 3
At the bottom-left, select Account Actions > Add Mail Account.
Account Settings Menu
Account Settings Menu
Step 4
Enter Your name, your full 1&1 Email address and the Password. Check the box for Remember password if you do not wish to enter your password every time when checking or sending e-mail. Then, click Continue.
Mail Account Setup Menu
Mail Account Setup Menu
Step 5
Suggested settings may be provided for you automatically. If Thunderbird does not find your settings or you would simply like to proceeed manually, click the Manual Config button. Configuration Lookup
Configuration Lookup
Step 6
Enter the required information in the appropriate fields and click Done when you are completed.
Manual Configuration
Manual Configuration
Incoming Server Settings (A)
Field Entry
Incoming Server hostname imap.1and1.co.uk
Incoming Port Number 993
SSL drop-down menu SSL/TLS
Authentication drop-down menu Normal password
Outgoing Server Settings (B)
Field Entry
Outgoing Server hostname auth.smtp.1and1.co.uk
Outgoing Port Number 587
SSL drop-down menu STARTTLS
Authentication drop-down menu Normal password
Username (C)
Field Entry
User Name Your full 1&1 Mail Basic address
Step 7
Click OK.
Account Settings
Account Settings

You will see your newly added account under Local Folders.
Local folders > Configured account

Local folders > Configured account

For additional information, you may want to reference: