Outlook 2010 Error: Security certificate cannot be verified

If you have incorrectly configured your Outlook 2010 email client, then the server you are connected to may show an error saying that the security certificate cannot be verified. The error may appear as per the screenshot below:

outlook2010-ssl

 

Troubleshooting the Outlook 2010 error: Security Certificate cannot be verified

This error is caused by a mismatch when enabling SSL and your port number in your account settings. Open Account Settings in Outlook and click on the advanced tab. If you need further assistance to open your account settings.

outlook9

Verify that you are using the correct ports for the incoming and outgoing mail server. If you are going to use the SSL enabled settings you will need to use the correct servers.

You should always use mail.domain.tld for your mail servers.

We recommend using the SSL enable options. If by chance you are in a school or somewhere that may have these ports blocked, you can use the non-ssl settings. The correct ports are below:

Non-SSL incoming POP: 110

Non-SSL incoming IMAP: 143

Non-SSL outgoing SMTP: 587

SSL enabled incoming POP: 995

SSL enabled incoming IMAP: 993

SSL enabled outgoing SMTP: 465

NB : Please ensure you enable Letsencrypt ssl for email via the Letsencrypt plugin via Plesk Interface or cPanel Interfaces.

  • 0 Users Found This Useful
Was this answer helpful?

Related Articles

530 Relaying not allowed in a Email Clients

This error occurs when a user or mail client attempts to send email without authenticating on the...

How to do a Telnet

Telnet is used to test open ports or administer remote servers via the command prompt.The telnet...

How to do a Tracert

A traceroute is a function which traces the path from one network to another. It allows us to...

How to do a Ping

Ping is a command used to test whether a host is reachable via your internet connection. The...

Error Page Codes

These are probably the most common error codes that a visitor might see, you may like to create...