Step Wise Manual Tre mail settings for thunderbird
If you don't have a Tre mail address. you can create an email id from here then you can Tre 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, Tre Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below Tre incoming server settings.
In incoming click on the dropdown menu and select IMAP.
Add server host :imap.tre.it
Port: 143
select SSL/TLS
Enter Below Tre outgoing server settings.
In outgoing select SMTP.
Add server host :smtp.tre.it
Port: 25
select SSL/TLS
Tap on Done. Now you are ready to use your Tre email account on your Thunderbird.