How to solve ThunderBird failed to find the settings problem?

Heya,

1. Verify Postfix Configuration

• Ensure that your Postfix server is correctly configured and running. Check the main configuration file (typically /etc/postfix/main.cf) for any discrepancies from your previous setup.
• Make sure Postfix is listening on the correct interfaces and ports. For SMTP, it’s usually port 25, 465 (with SSL), or 587 (for submission).

2. Check Mail Logs

• Review the mail logs to identify any errors or warnings. These logs can often provide insights into what’s going wrong. The mail logs are typically located at /var/log/mail.log or /var/log/mail.err.

sudo tail -f /var/log/mail.log
sudo tail -f /var/log/mail.err

3. Test SMTP Connectivity

• Test SMTP connectivity to ensure that your Postfix server is reachable and responding. You can use telnet or openssl to connect to your SMTP server:

openssl s_client -connect your_domain.com:465 

4. DNS and MX Records

• Ensure that the DNS settings for your domain are correctly configured. This includes MX records pointing to your mail server.

• Use online tools or the dig command to verify your domain’s MX records:

dig mx your_domain.com

5. Configure Thunderbird Manually

• If Thunderbird can’t automatically find the settings, try setting up the account manually:
  • In Thunderbird, go to account settings and add a new email account.
  • Choose to configure the account manually.
  • Enter the incoming (IMAP or POP3) and outgoing (SMTP) server details as per your Postfix configuration.

6. Check Firewall and Network Settings

• If you have a firewall enabled on your Postfix server, ensure that it allows incoming connections on the relevant SMTP, IMAP, or POP3 ports.
• If your server is behind a NAT or router, ensure the ports are forwarded correctly.

Additionally, what settings were you previously using?

For now, I can access my mail account manually in ThunderBird. However, I cannot send or receive mail from another user. How to fix it?