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Most of the time the User Name is just the account name, but some configurations may require a complete e-mail address. If you are still having trouble connecting to the SMTP server, Thunderbird will usually display a message, but depending on the type of error, sometimes it does not. If you can access the Internet using your browser, you should be able to send e-mail messages once the SMTP information is correct. If it still does not work or you see an error, make sure that you Internet access is active. If you have multiple e-mail accounts and you know that inbound e-mail is working, try sending a test message to another of your e-mail addresses. When you are sure that this information is correct, click the OK button, shut down Thunderbird and then start it up again to make sure that any new settings are loaded. That is the name to the left of the in your primary e-mail address. The account name is usually just the primary account name from your ISP. You will need to get this information from your hosting company or ISP. The Server Name and the User Name are the two important areas to focus on. The Description is not important, but you can certainly enter a description to differentiate SMTP accounts. Highlight an SMTP account and click the Edit button. The section that you want is at the top of the right-hand side. Scroll down to the bottom of the list if e-mail accounts.Select Account Settings from the Tools menu.Most of the configuration issues with sending e-mail can be resolved in the Server Settings section in Thunderbird. That is because in most cases it can be shared by all of your e-mail accounts. Thunderbird identifies the first SMTP account that you set up as being the default account. Most SMTP mail servers are set up to allow e-mail accounts from other ISPs to be run through them. Unlike setting up an e-mail retrieval for inbound e-mail, with SMTP, a single SMTP setup can be used to cover all of your e-mail addresses, regardless of how many different ISPs are involved. However, there are fewer factors involved when setting up the SMTP section in Thunderbird, so isolating the problem can be much simpler.
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Outbound e-mail problems can be frustrating to deal with because you rarely see an indicator as to what might be causing the problem. The e-mail is stored on the server until retrieved by another e-mail client using a POP3 or IMAP retrieval protocol.
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SMTP is generally used to send messages from a mail client (Thunderbird) to a mail server. SMTP is the standard for e-mail transmissions across the Internet. Outbound e-mail uses a process called SMTP (simple mail transport protocol). Troubleshooting these types of problems in Mozilla’s Thunderbird is fairly easy if you understand how outbound e-mail works. Outgoing e-mail problems can sometimes be more difficult to troubleshoot than incoming e-mail problems.