How to fix Mozilla Thunderbird cannot send messages?

 Verify your SMTP outgoing email settings

  • In the Thunderbird menu bar, click the Tools menu and select Account Settings, or click the Application menu button New Fx Menu and select Options and Account Settings from the sub-menu, and select Outgoing Server (SMTP) from the bottom of the list in the left panel. Check that the settings are the same as documented on the mail settings article for your mail provider.
  • Check that your Thunderbird settings match the documented settings.


Verify the correct SMTP Server is being used

  • In the Thunderbird menu bar, click the Tools menu and select Account Settings, or click the Application menu button New Fx Menu and select Options and Account Settings from the sub-menu, and select the account name. Verify that you are using the right SMTP server for the email address. Most of the time you cannot send messages from one account provider using another account provider's service. For example, you cannot send a mail from "joe@gmail.com" through Yahoo's SMTP server.


Verify that your outgoing email is not being blocked

Verify that your outgoing email is not being blocked by your firewall, antivirus software or your Internet Service Provider:

  • Try briefly turning both antivirus and firewall software off, sending a test email and turning them on and sending another test email.
  • Many ISPs block outgoing email on port 25. You may have to switch to another port (e.g. 587 or 465). Contact your ISP's support to see if they are blocking your outgoing email port.
If still issue is not resolved Call +1-856-514-8666 for help and Mozilla Thunderbird Support.

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