
Apache SpamAssassin
7.4#4 in email anti-spam softwareFree planFree planAPILinuxmacOSSelf-hosted
Visit
SpamAssassin suits system administrators who want to filter unsolicited email on a server and configure tests or rules. Its API and Perl modules also suit teams integrating filtering into supported mail systems.
JetEmail may suit organizations that want web-based email marketing with automation and audience segmentation. The free tier covers up to 1,000 subscribers, while paid options list capacities from 5,000 to 1,000,000 subscribers.