Good afternoon all,

Currently our company is running M365 E3 accounts and I am trying to figure the encryption of emails to send things out securely. I am not a wizard with any of this stuff and am still learning. End goal I want to be able to send out encrypted to emails to send out CUI correctly if need be. Where should I start with this? I have an Entrust SMIME cert that I have been trying to tinker with but sending things out to others without the cert gives me an error. Any questions or advice would be helpful.