SpamAssassin - Use this program to "Unspam" your mailbox(es).

NeoCertified Secure Email - NeoCertified is a solution that provides secure email encryption for businesses and organizations across all industries, including healthcare, finance, legal, non-profit and education.

Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...

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?

Oikik Antispam - Oikik is a cloud-based email filtering service that works with your existing email service.

Proofpoint Email Encryption - As email is the preferred medium for business communications, preventing confidential information from being leaked in outbound email messages must be a top priority in order to lower the risk of a data breach.