Send your issue to a test address and see where it landed at twelve mailbox providers, inbox or spam. The same report runs 42 technical checks on the copy that arrived: SPF, DKIM and DMARC alignment, blocklists, two spam engines, the Gmail and Yahoo bulk sender rules, and the content itself. Every problem comes with a plain-language fix. Free, no signup, with an API and an MCP server if you want to test from a script or an AI agent.
Xem is an open-source workspace for email campaigns, recurring newsletters, reusable templates, audience lists, signup forms and visual automations. Design emails in the visual editor, organize contacts, and review campaign analytics. Connect your own SMTP provider or use Xem’s managed sending through Amazon SES. Managed sending requires domain verification and workspace approval.
Price Comparison
Feature Comparison
Email Spam Tester and Xem both have great feature sets so the right tool for you really depends on your needs.
| Features | Email Spam Tester | Xem |
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