Forward all outgoing e-mails w/ Office 365 - 3rd party vendor


We have a 3rd party vendor that encrypts our outgoing e-mail.  We just set up a mail domain with 365 with godaddy.  I am having trouble finding where I go to reroute all my domain's e-mail accounts outgoing e-mail to that vendor where it will be encrypted.  I suspect my problem may be terminology differences from what the encryption company is referring to this process as and what GoDaddy refers to the same feature.  Anyway, if anyone has advice as to where I would find that setting, I would be grateful.