How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?

The error ‘Unable to sign or encrypt message. Certificate not installed.’ means that the email account you are trying to use on your device may have encountered an error during set up. 

 

You will need to remove the account and set it up again. 

 

First, you’ll need to remove your email account from your device.

1 From the front screen, choose Apps.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
2 Choose Settings.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
3 Choose Accounts (you may need to scroll down a little)
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
4 Choose Email.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?

The next step will differ slightly, depending on the operating system on your device.

5 Choose More (Marshmallow OS) or tap the account and then tap the three dots in the right hand corner (Lollipop OS)
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
6 Then choose Remove account.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?

Next add the account again.

1 From the front screen choose Apps.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
2 Choose Settings.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
3 Choose Accounts.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
4 Choose Add account.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
5 Then choose Email.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
6 Enter your email address and the password to your email account and choose Sign In.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
7 Make sure the sync schedule is set to Manual, then tap Next.
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?
8 Fill out the setup with the settings that your email provider requires, then choose Done. (you can find these settings on the email provider's website, if not contact them for details).
How do I prevent the error 'Unable to sign or encrypt message. Certificate not installed'?

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