$ cd ~/gtm-os/features/

Email Deliverability Toolkit

Free tools for GTM engineers who run cold email at scale. Check your MX records, calculate sending capacity, score domain health, and plan warmup timelines - all from your browser.

MX Record Checker

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Look up the mail exchange records for any domain. Identifies the email provider (Google Workspace, Microsoft 365, or other) and shows all MX entries with priority.

Domain

Deliverability Multiplier Calculator

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Sending Volume Planner

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Domain Health Scorer

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Warmup Timeline Generator

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