Virtru - Virtru is your data privacy force field, wrapping and protecting emails and files wherever they're shared. Easy-to-use data security software for business. People also askIs Virtru Hipaa compliant?
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Encyro - Use Encyro to send sensitive messages and files to your customers and service providers, including accountants, loan officers, health coaches, and others. Stay organized and forward documents from your mobile device.
Proxmox Mail Gateway - Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.