Getting email certificate errors? Here’s how to fix this issue

By: Elsie Otachi
3 minute read
email certificate error

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You may have tried at least once to login to your email and encountered an email certificate error, but didn’t know how to work around it.

Certificate errors happen whenever there’s an issue with a certificate, or a web server’s use of the certificate itself, thus Internet Explorer, Edge, Chrome and other browsers display red flags through warnings about certificate errors.

The most common reason is that the certificate is valid for a certain period of time, so if your computer’s date and/or time is set to a different date or time, then you are likely to get the email certificate error warning.

However, if you still get the email certificate error even after adjusting the date and time, then it is possible that either the certificate of the website itself has expired and needs to be renewed, or, the website is not to be trusted.

You could have encountered the email certificate error on a site you visit regularly without errors, so in this case, the website itself may not be configured correctly.

Another cause could be that the website’s certificate has expired and the owner or operator needs to renew it so that you continue using it, as this cannot be corrected in your browser.

When you get an email certificate error, it is advisable that you do not put important login identity or passwords on such pages.

How to fix an email certificate error

  1. Adjust time/date to appropriate values
  2. Retype the address
  3. Configure usage of mail over SSL settings

1. Adjust time/date to appropriate values

Check to ensure your time and date on the computer are set to the appropriate or correct values. If you set ahead or behind of the actual time/date, the certificate can read as invalid.

Here’s how to check time/date settings and adjust them:

  • Right click Clock on the taskbar

email certificate error

  • Click Adjust time/date

email certificate error


For various PC problems, we recommend this tool.

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

  1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
  2. Click “Start Scan” to find Windows issues that could be causing PC problems.
  3. Click “Repair All” to fix all issues with Patended Technologies (requires upgrade).

  • Click Change date and time

email certificate error

  • Set the correct date and time
  • Click OK

2.Retype the address

If it’s a site you visit regularly and you hardly get any email certificate error, the site itself may not be configured correctly. Try and retype the address then see if the problem persists.

3. Configure the use of mail over SSL settings

If you’re trying to connect to your email using a default mail server name, what happens is there’s a mismatch between the domain name, and that of the shared SSL certificate on the server, which results in an email certificate error.

In order to remove the email certificate error you receive, configure your email client with an SSL setting, because by default, when sending or receiving emails, they’re not encrypted so if they’re vulnerable and easy to intercept by cyber criminals.

Some users opt to use email over SSL owing to restrictions by their internet service provider that prevents them from sending any email messages.

In order to use your email over an SSL, update the settings for both incoming and outgoing servers, plus ensure your email client has port 465 configured as the SMTP port.

Have any of the above solutions helped resolve the email certificate error for you? Let us know by leaving your comment in the section below.

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For various PC problems, we recommend this tool.

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

  1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
  2. Click “Start Scan” to find Windows issues that could be causing PC problems.
  3. Click “Repair All” to fix all issues with Patended Technologies (requires upgrade).

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