Outlook certificate error usually pops-up while you try to access insecure mail servers. It is immediate protocol taken by your server to provide a safe and secure user experience. However, in some guided cases you might encounter the Outlook certificate error saying “certificate that cannot be verified” or “security certificate invalid” from a known mail address. This write-up will help you understand the simple solutions to fix them.
An Outlook security certificate is a digital certificate to secure emails on Microsoft Outlook. It is used to sign the emails in Outlook so that the receiver can be sure that the email has come from a legitimate person and has not been intercepted or altered by any other person. if you are one of the users who is encountering an Outlook certificate error, then this could be due to various reasons. In this article, you will find 3 effective manual solutions on how to fix the Outlook certificate error for free.
Outlook certificate indicates the originality and verified email server on the recipient's end. This is an automated email protocol taken by Outlook to ensure a safe and secure user experience. If there is a mismatch in the SMTP/IMAP settings, port settings, or domain name settings, the certificate will not be trusted or recognized.
Note: You can easily resolve the Outlook certificate error using the manual methods mentioned in this article. If you encounter any Microsoft Outlook errors like Outlook data file not opening, PST file not showing emails, CRC error, etc., then you should make use of a reliable Outlook PST repair tool.
Remo Repair PST is one such utility, which can effortlessly fix the above-mentioned errors with ease. The tool works with a read-only mechanism to repair the PST file corruption to recover all your Outlook emails and other items
Whenever you encounter an Outlook certificate error, your priority has to check whether the name of the certificate and the mail server is the same or not. For establishing a smooth connection between the mail server and the email client, it is necessary to have the name of the mail server and 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.
Most of the time, Internet service providers block the outgoing SMTP port (Such as Outgoing port 25). And this leads to the Outlook security certificate error. Therefore, you need to change the server from a blocked port to some other port to resolve this issue. Follow the steps below.
Note: Few Internet service providers block the Outgoing SMTP port. Therefore, you need to change the server to 465 if you want to use the SSL port. This way, you can fix the Outlook security certificate error. But, if you are installing a security certificate, choose only a custom security certificate or a certificate assigned only for a particular mail server.
Various institutions might block some of the mail servers such as POP 995, IMAP 993, and SMTP 465 due to security or privacy reasons. During this scenario, if you want to fix the Outlook certificate error then you should use the non-SSL ports.
Note: The non-secure ports are at risk of data theft. However, they also have some security parameters. POP 110, IMAP 143, and SMTP 587 are a few examples of non-SSL ports.
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.
To install the certificate in Outlook you'll need the follow the to-do list below
Once you have exported the certificate follow the listed methods below
The Remo Outlook PST Repair Tool is a versatile piece of software for fixing broken and damaged PST files. It can resolve Outlook security certificate errors and complex problems in the Outlook data file. This approach is a quick and efficient technique to fix the Outlook certificate error and is an automatic fix for Outlook errors.
Steps to fix Outlook Certificate Error using Remo PST Repair Tool
Follow the Instructions to Fix Outlook Certificate Error
Step 1. Launch the Remo PST Repair tool, and select from the list of three options.
Step 2. On the next screen, choose between two scan options Normal and Smart Scan.
Step 3. Click on Repair to fix your certificate error in Outlook. After completion of the repair process, Preview the repaired PST file and check if all parameters are intact.
Step 4. Activate the tool and save the repaired PST file, and import repaired PST file into Outlook and see if certificate errors disappear.
Conclusion
The above article summarizes how to fix Outlook certificate errors, by following the above-listed manual methods you can effortlessly repair the error. Even after implementing the manual methods if the issue precedes, Remo Repair PST is the go-to tool for you. For any further queries regarding the Outlook error, make use of the comment section below.
To ensure safe and secure email exchange protocols to legitimate servers, Outlook has made it mandatory to have a recognized certificate. In some cases, if the certificate has expired or is invalid you may encounter a security certificate warning
a. As mentioned above, follow the above-listed methods to easily fix the security certificate error in Outlook 365
b. Verify the certificate name
c. Change the outgoing STMP port
d. Use unsecure port
e. By using the domain name of the hosting server
f. By installing the certificate in case of expiry
An Outlook encryption certificate is a digital certificate used to encrypt your emails on Outlook using public key infrastructure