You may see an SSL certificate warning when setting up or using your mailbox if your email client is configured with an outdated mail server address.
Our current mail server settings use secure connections and valid SSL certificates. To avoid certificate warnings, make sure your email client is configured with the correct mail server settings.
Incoming settings (IMAP):
Incoming IMAP Server: imap.extendcp.co.uk
Incoming IMAP Server Port: 993
Incoming IMAP SSL: SSL/TLS
Outgoing settings (SMTP):
Outgoing Mail Server: mta.extendcp.co.uk
Outgoing Mail Server Port: 587
Outgoing Mail Server SSL: STARTTLS
If you receive an SSL certificate warning, check the mail server settings in your email client. If you are using an older mail server address such as mail.yourdomain.com, update it to the current server addresses listed above. You should not need to accept or permanently ignore an SSL certificate warning when using the current mail server settings.
After updating the settings, restart your email client if necessary and try connecting to your mailbox again.
If you continue to receive an SSL warning after using the current settings, check that the server names have been entered exactly as shown above. Alternatively, it would be recommended to remove and re-add the mailbox to your mail account.
Article ID: 259
Created On: Fri, Mar 13, 2015 at 11:51 AM
Last Updated On: Fri, Sep 18, 2026 at 9:49 AM
Online URL: https://www.heartinternet.uk/support/article/why-do-i-see-an-ssl-warning-when-connecting-to-my-mailbox-or-sending-emails-with-a-mail-client.html