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GlockApps

Freemium — simulated deliverability across major providers (Gmail, Outlook); shows inbox/spam placement and content/technical issues.

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GlockApps simulates sending to a network of inboxes (Gmail, Yahoo, Outlook, Apple) and reports whether your message lands in Inbox, Spam, or is blocked. It also surfaces content warnings, authentication failures, and blacklist status. The platform is more deliverability-focused (not just spam score) and gives comprehensive, per-provider placement data — very useful for campaign validation. Free tier/trial available with limited tests.

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