Written By Mithilesh Tata
Updated on May 12th, 2022
This article will guide you on how to fix Outlook Security Certificate Error. It also explains the main reasons for the issue because, before resolving any error, you must know its causes.
The security error in Outlook arises when you are trying to connect to an insecure email server. A message appears on the screen showing the Outlook error the server you are connected to is using a security certificate that cannot be verified.
The error arises due to several causes. So, let us learn them all.
After learning the reasons, you will learn how to disable security certificate warning in Outlook 2016. You can fix the error by using various manual techniques. Although manual steps are easy and effective, you must have the basic technical knowledge to perform them. You do not need any additional software to fix the error message. Following are the methods to resolve the Outlook certificate issue or fix the Outlook error.
The first thing you should do is to check whether the name of the certificate and the mail server is the same or not. For establishing a connection between the mail server and email client, it is necessary to have the name of the mail server on the security certificate.
Follow the steps to verify the name on the certificate.
Note: In case the certificate has multiple names, you can try every hostname one by one. If none of them is appropriate, contact your Internet Service Provider for the correct mail server.
The hosting providers host a large number of domains. In the case of shared hosting, they provide the same server for various domains. So, the security issue arises because these hosting companies do not renew the SSL certificate for every domain. They only expend the certificate for their domain name.
So, it is suitable to use the domain name of your hosting company instead of your domain name as the mail server.
For example- “mail.yourhostingdomain.com” instead of “mail.yourdomain.com”
In places like universities, colleges, companies, etc., they block many popular mail servers. They block POP 995, IMAP 993, and SMTP 465 for some security reasons. So, you can use the non-SSL ports because they are not blocked. The non-secure ports are at risk of data theft. However, they also have some security parameters. The following are the non-SSL ports.
Because of spamming, some Internet service providers block the SMTP port 25. Therefore, you need to change the server from 25 to some other port. This way, you can fix the Outlook security certificate error. Follow the steps below.
Notes: If you are installing a security certificate, choose only a custom security certificate or a certificate assigned only for a particular mail server.
Sometimes, the security certificate warning in Microsoft Outlook occurs due to corrupted PST files. You can repair data files using scanpst.exe, but it is not a reliable and permanent solution. It can only fix minor issues. So, you must have an advanced alternative to resolve the problem.
The Outlook PST Repair Tool is a comprehensive software for repairing damaged and corrupted PST files. It can fix complicated issues in the Outlook data file and resolve the Outlook security certificate errors. This method is an automatic solution for the Outlook error, and it is a fast and effective way to fix the Outlook 2016 certificate error.
Thanks for reading the complete article. Hopefully, it answered all your questions, and you learned how to fix the Outlook security certificate error. The manual steps are easy but do not ensure the elimination of the error. Also, if the error arises due to corrupt PST files, the manual technique can not fix it. The best way is to use third-party software like Outlook PST Repair Tool an advanced solution to repair the corrupted PST files and resolve different Outlook error messages. Thanks for reading this article. For the latest Outlook realted updates visit this MSOutlook Help Blog regularly.
About The Author:
Mithilesh Tata is an Email Migration and Data Recovery Expert. He has a keen interest in Technology & Entrepreneurship. Also, he loves cricket, music, and books.