Error while sending SMTP email from Thunderbird

Asked By 70 points N/A Posted on -


I successfully installed 5.0 and my browsing and email was perfect. However when I tried to send an SMTP email from Thunderbird, I got this error message.

An error occurred while sending mail

An error occurred while sending mail. The mail server responded: Authentication required. Please verify that your email address is correct in your Mail preference and try again.

However if I turn off outgoing mail checking in Avast, I am able to send SMTP email just fine, I changed the Thunderbird SMTP setting to secure and was able to send the email but got a warning from Avast that I should not change the settings, my security is built-in to Avast.

Anyone with ideas how I can resolve this? 

Answered By 30 points N/A #135416

Error while sending SMTP email from Thunderbird

Hi there,
This is a known bug that will be easily be solved by upgrading your antivirus software.
However, if you don't feel like upgrading your antivirus, there is a work around.
First, open your Avast. Under the Real Time Shields – Mail Shield – Expert Settings uncheck the Scan Outbound Message box.
Avasti Free Antivirus
Also, into the ADD section enter your SMTP server IP address, protocol: SMTP, port: 25 and encryption: none.
Once you're done, delete and recreate the mail account making sure the connection security is set to none.
Authentication Method
Everything should work after the restart.

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