Apache SpamAssassin vs JetEmail

Apache SpamAssassin is free, open-source software that classifies email to help system administrators block unsolicited bulk messages. It runs on a server to filter mail before it reaches a mailbox. Detection combines header and text analysis, Bayesian filtering, DNS blocklists, collaborative filtering databases, and local and network tests. Its scoring framework and plugins add heuristic and statistical checks. Tests and configuration are stored as plain text, so administrators can adjust settings and add rules. The Mail::SpamAssassin API can be integrated with systems such as procmail, sendmail, Postfix, and qmail. The core distribution includes command-line filtering tools and Perl modules for use in other products. The downloads page lists version 4.0.2 as the released version. Official releases are signed, with GPG signatures and SHA-256 and SHA-512 checksum links for downloads. Users can ask questions on the mailing list; developers and PMC members answer as time permits.

JetEmail combines transactional email delivery, inbound filtering, and email marketing in a web-based platform with API access. Outbound messages can be sent through SMTP or a REST API using the same allowance. The Marketing Suite includes campaigns, templates, segments, custom fields, signup forms, automations, and reporting for opens, clicks, bounces, and unsubscribes. Its free tier does not expire and covers up to 1,000 subscribers with 1 GB of image storage. Paid Marketing Suite plans start at $29 a month for 5,000 subscribers; this Starter tier includes unlimited marketing sends, 100 AI requests per month, and 1 TB of image storage. Inbound filtering can block spam, phishing, and malware, then quarantine or deliver filtered mail by SMTP, webhook, or forwarding. The API supports attachments up to 40 MB, batches of 100, scheduled sends up to 30 days ahead, idempotency keys, and signed delivery webhooks. JetEmail lists integrations for cPanel, DirectAdmin, Enhance, and WordPress, and SDKs for six programming languages. It was founded in 2024 and is based in Australia.