• In Outlook, select 'File' and then 'Options'
• Select 'Trust Center' then 'Trust Center Settings'
• Select 'E-mail Security' and then 'Settings'
• Under Certificates and Algorithms, Select 'Choose..' next to 'Signing Certificate'
• Select your DOD CA-## certificate and press OK
• Select 'Choose...' next to 'Encryption Certificate'
• Select your DOD EMAIL CA-## Certificate and press OK
• Select OK to close out of screen
• Select 'Publish to GAL..' to update (You may need to enter in your PIN)
• You should now be able to send/receive encrypted emails

 
If this still does not resolve the issue, please continue to submit a ticket.