Exchange 2013 OWA issues

Everytime a user try to encrypt an email on OWA they get an error saying the senders certificate can't be verified. Customers are using ie 11 and active client.
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sidewinder28Author Commented:
Here is a image of the error
Amit KumarCommented:
Certificate is not matching with user's e-mail address. make sure you have certificate which is actually signed for e-mail address of user
sidewinder28Author Commented:
Thank you, but Fixed it. In Exchange 2013 OWA has a setting to set the encryption algorithm which was set to AES128 or 6610. I had to change it to 3des or 6603 for it to use the encryption certificate.

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sidewinder28Author Commented:
Once I changed the setting it worked.
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