Based on forum post
ΒΆ Thunderbird + PGP
How to setup email on DMZ on Linux using Thunderbird email client and use OpenPGP for exchange of encrypted and/or signed messages
First open Thunderbird and enter your username, email and password that you previously created on dmz.rs, click Continue.
After that you should see successful configuration notification, click Done
Account successfully created, click Finish.
You will se default look for your account on Thunderbird.
But we need to check outgoing settings for email, click Account Settings in top right corner and then select Outgoing Server (SMTP). Make sure server name is only dmz.rs (defailt email.dmz.rs is incorrect). Click OK
