I've just discovered Thunderbird, and it works great for my Gmail account. I have my own VPS that uses cPanel and I am trying to get all my email accounts from the domain names into Thunderbird, but I cannot seem to figure out this STMP server junk. My incoming mail server is secure, but Thunderbird can't find my STMP server. I have found the information for my STMP server (which, for all my domains, is mail.domainname.com). Each address requires to be authenticated..which I would love to have it authenticated, but I don't know how. Each time a security thing pops up that says the certificate cannot be located on this site or something of that nature. I tried doing a manual setup, but apparently I am not doing it right because each time I try to view the messages it says "Login to server mail.domainname.com failed". I have no clue what the heck I am doing wrong! Why is it failing? I have never used an email client before, so this is very frustrating. I need help! Can anyone tell me what to do? I will provide as much information as I can if you need more.
Are you configuring SMTPS (465) in your email client OR SMTP (25)? If you have configured SMTPS, then it will prompt you for the SSL certificate which is not installed on the server by default. What you can do here is, install a self signed certificate on the hostname of your server from WHM and use the hostname as SMTP and POP3 server in your email client instead of mail.domainname.com. You need to make sure the hostname of your server is resolving to your server IP.