Since the update on or about March 28th (v24 ?), email send and receive fails
When EMail scanning is enabled, send/receive is blocked.
Windows 11
Thunderbird 128.8.1esr (64-bit)
Error message when mail protection enabled:
Sending of the message failed.
The message could not be sent because connecting to Outgoing server (SMTP) failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again.
~ fwiw ~I’m not Thunderbird user. Lets ask @peterweb~
AI Overview
If you’re experiencing outgoing SMTP server issues with Thunderbird and Norton, ensure your SMTP settings are correct, that Norton isn’t blocking outgoing emails, and try temporarily disabling Norton to test if it’s the cause.
Here’s a more detailed breakdown:
Verify SMTP Settings:
Correct Server:
Double-check that you’re using the correct SMTP server address and port number for your email provider.
Authentication:
Ensure SMTP authentication is enabled and configured correctly in Thunderbird.
Connection Security:
Select the appropriate connection security (SSL, TLS, or None) and authentication method (e.g., “Normal password”).
Check with Provider:
If you’re unsure about the correct settings, consult your email provider’s documentation or support.
Norton Interference:
Temporary Disable:
Try temporarily disabling Norton’s antivirus, VPN, proxy, and firewall software to see if it resolves the issue.
Check Blocked List:
Make sure your email address or domain isn’t accidentally added to Norton’s blocked list.
Allowed List:
If you suspect Norton is blocking emails, add your email address or domain to Norton’s allowed list.
Thunderbird Troubleshooting:
Delete SMTP Password: Try deleting your SMTP password in Thunderbird and re-entering it.
Reinstall Thunderbird: If the issue persists, consider reinstalling Thunderbird.
Check Thunderbird Logs: Examine Thunderbird’s logs for any error messages that might provide more clues about the problem.
Other Potential Issues:
Network Problems: Ensure you have a stable internet connection.
Firewall Issues: Check your firewall settings to make sure they aren’t blocking outgoing email traffic.
Outdated Thunderbird: Make sure you’re using the latest version of Thunderbird.
AI Overview
The error “The message could not be sent because connecting to Outgoing server (SMTP) failed” usually indicates an issue with your email client’s SMTP settings or a problem with your internet connection or email provider. To fix it, verify your SMTP settings, ensure your internet connection is stable, and check for any firewall or antivirus software blocking outgoing emails.
Here’s a more detailed breakdown of potential causes and solutions:
Verify Your SMTP Settings:
Check for Correct Server Address:
Ensure the SMTP server address (e.g., smtp.example.com) is accurate and matches the one provided by your email provider.
Verify Port Number:
The standard SMTP port is 587 (with STARTTLS) or 465 (with SSL/TLS). Check with your email provider for the correct port number.
Authentication Details:
Make sure your username and password are correctly entered, and that your email client is configured to use the correct authentication method (e.g., Normal Password, OAuth2).
Encryption:
Ensure that the encryption settings (e.g., SSL/TLS, STARTTLS) are correctly configured, as directed by your email provider.
Check Your Internet Connection:
Restart Router/Modem: A simple restart can often resolve temporary connection issues.
Test with Another Device: If possible, try sending an email from another device on the same network to see if the issue persists.
Check for Firewall or Antivirus Interference:
Temporarily Disable Firewall/Antivirus:
See if disabling your firewall or antivirus software temporarily allows you to send emails. If it does, you may need to configure your antivirus/firewall to allow outgoing emails through the SMTP server.
Check Antivirus Settings:
Some antivirus programs have email scanning features that can interfere with sending emails. Check your antivirus settings and see if you can disable or adjust the outgoing email scanning.
Contact Your Email Provider:
Check for Outages:
If you’ve verified all your settings and your internet connection is working, there might be an outage on your email provider’s end. Check their website or social media for any announcements.
Request SMTP Settings:
If you’re unsure of your SMTP settings, contact your email provider’s support team for assistance.
This is NOT a client or user problem. I have been using my current client and settings for years, it’s been since the new ‘upgrade’ that causes the problem. It’s the Norton Email scan setting that is at fault.
If your Norton is not working as expected after you’ve tried Reset to Default &or Repair Norton & clean re-install Norton 360…then…reach out to Norton support.
Norton Community is primarily user-to-user “working” product help.
