Proxmox Mail Gateway AlternativesAnti-Spam Tools and other similar apps like Proxmox Mail Gateway

mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.

Use this program to "Unspam" your mailbox(es). The program can be integrated with the mail server to automatically filter all mail for a site. It can also be run by individual users on their own mailbox and integrates with several mail programs.

Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules including regular expressions, statistical analysis and custom services such as URL black lists.

MailScanner is a open source email security system design for Linux-based email gateways. It is used at over 30,000 sites around the world, protecting top government departments, commercial corporations and educational institutions.

Scrollout F1 is a free self-hosted email gateway designed for Linux & Windows administrators without advanced email security experience.

Xeams is a secure and powerful mail server for that includes a powerful spam filtering engine that eliminates up to 99% of junk email right out of the box. The software offers a flexible approach to email, making it a very user friendly server.

EuropeanMX blocks incoming spam and virus emails before they are reaching your network. With our outgoing filter you can secure your server's reputation. And last but not least we are offering encrypted cloud storage to archive all your emails.

The oikik hosted antispam system is divided into multiple filtering layer that a message passes through prior to being delivered to your inbox. If a message successfully passes through every stage of filters, it gets placed into a delivery queue, and is sent along to your mail...

A Linux based email gateway that filters email for viruses, spam, malware, phishing, and other threats. Works with any email server and any email provider such as Office 365.