18.2
Rspamd is an open-source email security engine designed to filter phishing, business email compromise, malicious attachments, and spam.
Free planOpen sourceWebAPILinux
Alternatives to Retarus Email Security
28.0
SPAMfighter is Windows software for filtering unwanted email in supported mail programs.
Free planAndroidiOSExtension
37.8
MailWasher lets users preview messages on the mail server and remove unwanted email before downloading it to a computer.
Free planAndroidiOSSelf-hosted
- 4
Apache SpamAssassin
Apache SpamAssassin is free, open-source software that classifies email and helps system administrators block unsolicited bulk messages.
Free planOpen sourceAPILinuxmacOSSelf-hosted7.4Free plan - 5
JetEmail
JetEmail is a web-based email marketing service with a free tier, paid plans, email automation, and audience segmentation.
Free planWebAPI7.1From $10 a month - 6
Mailprotector
Mailprotector builds and supports products for securing and managing organizational email, and says its products are made exclusively for managed service providers (MSPs).
Free planWebAPI7.0Free plan - 7
Symantec IT Management Suite
Symantec IT Management Suite manages, patches, and remediates application and operating system configurations across desktops, laptops, and servers…
WebAPILinuxmacOS6.8 - 8
SpamHero Business Email Security
SpamHero Business Email Security filters a domain’s incoming email in the cloud and forwards clean messages to the customer’s mail server.
WebAPI6.5From $5 a month - 9
Cisco Catalyst Center
Cisco Catalyst Center is a centralized controller and management dashboard for enterprise network operations.
WebAPILinuxmacOS6.2 - 10
Sophos Secure Message
Sophos Secure Message is part of Sophos Email, a cloud service that protects inboxes from phishing, business email compromise, spam, and email-delivered malware.
Web6.2 - 116.2From €5 a month
- 12
MailChannels Inbound Filtering
MailChannels Inbound Filtering is a cloud gateway for hosting providers that run email at scale.
WebAPI6.1 - 13
MX Guarddog
MX Guarddog is a cloud email gateway for standard SMTP servers used with owned domains.
Web6.1$0.25 usage-based - 14
SpamSieve
SpamSieve is a macOS application that adds spam filtering to compatible Mac mail programs.
macOS6.1$39.99 one-time - 15
Cleanmail
Cleanmail is an email security relay that filters unwanted and malicious email traffic for organisations.
WebSelf-hosted6.0 - 16
Libraesva Email Security
Libraesva Email Security provides layered, AI-driven protection against email threats for organizations.
WebSelf-hosted5.8 - 17
Proxmox Mail Gateway
Proxmox Mail Gateway is an open-source email gateway for Linux and the web, deployed in a gateway role with outbound filtering.
WebLinux5.8From €190 a year - 18
SpamTitan Gateway
SpamTitan Gateway is an anti-spam appliance for administrators who need to control mail flow and protect networks from unwanted email and malware.
WebSelf-hosted5.8 - 19
Mailinblack Protect
Mailinblack Protect is an email-security solution for companies, public administrations, and healthcare institutions.
WebAPISelf-hosted5.6 - 20
Barracuda Message Archiver
WebmacOSWindows5.3 - 21
Vade for Microsoft 365
Vade for Microsoft 365 is an email security service for managed service providers protecting Microsoft 365 environments.
Web5.3 - 225.1
- 235.0
- 244.9
- 25
4.8 - 264.7
- 27
NoSpamProxy
Web4.6