Step Wise Manual 123-reg mail settings for thunderbird
If you don't have a 123-reg mail address. you can create an email id from here then you can 123-reg email login.
Open Thunderbird Software App. Click on Email
When you click on the email, pop-up Set UP an Existing Account Screen.
Enter Your name, 123-reg Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below 123-reg incoming server settings.
In incoming click on the dropdown menu and select IMAP.
Add server host :imap.123-reg.co.uk
Port: 993
select SSL/TLS
Enter Below 123-reg outgoing server settings.
In outgoing select POP.
Add server host :pop.123-reg.co.uk
Port: 995
select SSL/TLS
Tap on Done. Now you are ready to use your 123-reg email account on your Thunderbird.