What are some alternatives?
When comparing amavisd-new and Rspamd, you can also consider the following products
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Proxmox Mail Gateway - Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.
Scrollout F1 - Scrollout is a free and easy to use anti-spam email gateway designed for Linux & Windows administrators without advanced email security experience.
Akamai - Akamai is the leading content delivery network (CDN) services provider for media and software delivery, and cloud security solutions.
Symantec Messaging Gateway - Anti-spam gateway blocks more than 99% of spam with less than one in 1 million false positives and...