What’s the difference between free and enterprise tools?

Free tools (MxToolbox free tier, mail-tester.com, Google Postmaster) provide basic checking: point-in-time authentication tests, single-message spam analysis, and limited reputation visibility. Good for spot checks but not continuous monitoring.

Enterprise tools (Validity, GlockApps paid tiers) provide: continuous monitoring with alerting, historical trending, comprehensive seed panel coverage, detailed analytics, API access, and support. They enable systematic deliverability management.

Choose based on: sending volume (higher volume justifies monitoring investment), deliverability sensitivity (revenue-critical email needs visibility), internal expertise (less expertise needs more tool guidance), and budget. Most serious senders benefit from some paid monitoring.