What are some alternatives?
When comparing Rspamd and Proxmox Mail Gateway, you can also consider the following products
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Scrollout F1 - Scrollout is a free and easy to use anti-spam email gateway designed for Linux & Windows administrators without advanced email security experience.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
amavisd-new - amavisd-new is a high-performance interface between mailer (MTA) and content checkers: virus...
Mailwasher - Over 8 million people use MailWasher as their spam filter
Symantec Messaging Gateway - Anti-spam gateway blocks more than 99% of spam with less than one in 1 million false positives and...