If Never didn’t work, try TLS, if available. I’ve seen a few that use TLS (Transport Layer Security), which is a type of secure connection. Most mail servers do not use a secure connection, so Never would be checked. The third item to test is the Security Settings. Sometimes this is the entire e-mail address and sometimes is is just the account name, which is the portion of the e-mail address to the left of the sign. Once again, the only way to know is to find out how your mail server is configured. Some use other subdomain names, such as. Most mail servers are identified by using a subdomain preceding the domain name, such as. You will need to get this information from your hosting company or ISP. The first thing to check is the Server Name. If you do not have detailed instructions from your ISP or hosting company, this is a trial-and-error process.
After making each change, click the OK button on this screen, close Thunderbird, re-open Thunderbird, and try to download your e-mail messages once again. If anything in this section is incorrect, you will not be able to download your e-mail. The section that you want is at the top of the right-hand side.
Most e-mail addresses today use the POP3 (Post Office Protocol 3) Internet protocol for receiving e-mail.
In this article we cover some of the more common connection issues you might find when using Thunderbird. If you are having problems retrieving your e-mail or getting it configured correctly, don’t give up. Troubleshooting connection problems with an e-mail client, such as the freebie Mozilla Thunderbird e-mail program can be frustrating and tricky.