Can not receive messages in Mozilla Thunderbird

Is your account configured correctly?

To view settings for an account, select Tools> Account Settings, then select Server Settings from the list on the left. Connection to the incoming mail server is configured at the top of the page.

Your email account provider can give you connection information about your server (perhaps on their website). Make sure your account settings match these settings.

Did your ability to receive mail suddenly stop? Was it working before?

• Check the status of your ISP’s service (many ISPs have a status or alert page on their website.) They may have technical problems.
• If your ISP provides a web-based email interface, try logging in and see your mail. If you can see your message, then the problem is probably related to your account configuration
• If you can not log into your ISP’s web-based email interface, your password may change. If so, it should also be replaced in Thunderbird. To change your password:
• Open Tools> Options (Windows) or Thunderbird> Preferences (MAC) or Edit> Preferences (Linux).
  On the Security page, click the Password tab and then click the saved password …
• Click the related account and then click Remove
• Close Thunderbird and open again. You will be asked to enter a new password for the account.
• If you have recently updated Thunderbird, check that your antivirus software is causing problems.
• If you recently updated Thunderbird to version 38, then check to be affected by changes related to the logjam.