+1 vote
in Email Support by (user.hidden) (1.7k points)
edited by (user.hidden)
From yesterday i am not able to send messages from Thunderbird. This problem arise after i upgrade to Thunderbird78. Facing a huge problem please help and get me out.

1 Answer

0 votes
by (user.hidden) (1.9k points)

Verify your SMTP outgoing email settings

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.

Verify the correct SMTP Server is being used

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.

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

Verify that your mail server supports the minimum version of TLS

Thunderbird 78 expects higher security standards for the so-called TLS network encryption protocol. If your provider does not support the newer versions of the protocol, sending and receiving of messages may fail. You can temporarily lower the bar to check if this is the reason for your problem (which obviously reduces security, so it's not recommended).