If your email app (such as Outlook, Apple Mail, or Thunderbird) displays a warning like "Invalid Certificate", "Untrusted Server", or "SSL Certificate Expired", the issue is almost always caused by an outdated mail server name saved in your app's settings.
Why Am I Seeing This Warning?
Many email apps were originally configured using older server names (such as
canada1.internic.ca or plesk246.internic.ca). While these legacy names still route your email behind the scenes via internal proxies, their security certificates are no longer renewed.When your email app connects, it notices that the security certificate does not match the old server name, causing it to pop up a security warning.
Who Needs to Update?
- Email Apps (Phone, Tablet, Desktop): ACTION REQUIRED. You must update the incoming and outgoing server names in your email app.
- Webmail Users (Browser): NO ACTION NEEDED. Webmail (
webmail.yourdomain.com) updates automatically in your browser.
How to Fix the Certificate Error
To permanently clear the security warning, update your email app settings to point directly to your domain's dedicated mail server address:
===================================================================================
REQUIRED SERVER SETTINGS UPDATE
===================================================================================
OLD SERVER NAME (Deprecated): canada1.internic.ca / plesk246.internic.ca (or similar)
NEW SERVER NAME (Required): mail.YOURDOMAIN.TLD (e.g., mail.example.ca)
===================================================================================Step-by-Step Instructions:
- Open your email app settings on your phone, tablet, or computer.
- Go to your account's Incoming Mail Server and Outgoing Mail Server (SMTP) settings.
- Replace the old server name (e.g.,
plesk246.internic.ca) withmail.yourdomain.com(replaceyourdomain.comwith your actual domain name, such asmail.example.ca). - Ensure SSL/TLS security is enabled:
- IMAP Incoming: Port
993(SSL/TLS) - POP3 Incoming: Port
995(SSL/TLS) - SMTP Outgoing: Port
465(SSL/TLS)
- Re-enter your email password in both the incoming and outgoing password fields.
- Save your changes and restart your email app.
Additional Troubleshooting
1. Refresh Your Server's SSL Certificate (For Hosting Account Admins)
If
mail.yourdomain.com continues to show a certificate error after you update your email app, refresh the free Let's Encrypt SSL certificate directly inside your Plesk control panel:- Log into your Internic Hosting Dashboard.
- Go to Websites & Domains > SSL/TLS Certificates.
- Click Re-issue Certificate (or Install a basic free certificate provided by Let's Encrypt).
- Make sure the box labeled "Secure mail containing the domain (mail.yourdomain.com)" is checked.
- Click Get it Free to install the updated certificate across your mail server.
2. Re-adding Your Email Account (Important Warning!)
If updating your settings does not clear the cached security prompt, you may need to delete and re-add your email account in your app.
CRITICAL WARNING BEFORE DELETING ANY EMAIL ACCOUNT:
Need Further Assistance?
If you continue to experience security prompts after updating your incoming and outgoing mail servers to
mail.yourdomain.com, please contact our support team.
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