Self-signed SSL error on Outlook/Thunderbird

After creating an email account in Plexa Panel some users would like to configure their email accounts to third party email clients such as Outlook or Thunderbird.

Both these clients have auto-discover functionality, this functionality will try to automatically configure your email settings so that end-user won’t have to do anything. For example, if on Thunderbird I configure:

  • User: support@plexacorp.com
  • Password: <your email password>

Thunderbird may suggest the following settings:

Server hostname: mail.plexacorp.com

IMAP Port: 143

Now Thunderbird will be looking for a valid SSL for mail.plexacorp.com and if valid SSL is not offered by the server you will get a self-signed SSL error.


How to resolve Self-signed SSL Error

Upon website creation, Plexa Panel will create mail.domain.com as a child domain to while creating a website and also issue SSL for it. Then Plexa Panel will add edit /etc/dovecot/dovecot.conf and add the following to the file:

local_name mail.domain.com {
ssl_cert = </etc/letsencrypt/livemail.domain.com/fullchain.pem
ssl_key = </etc/letsencrypt/live/mail.domain.com/privkey.pem
}

and then restart dovecot service using systemctl restart dovecot. This way there will be no SSL errors on either Outlook or Thunderbird.

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