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Puzzle Inbox provides pre-warmed Google Workspace and Outlook 365 inboxes to help agencies and sales teams scale cold email outreach fast. Every inbox comes fully configured with SPF, DKIM, and DMARC — ready to send straight away. Trusted by 1,200+ clients with over 70,800 active inboxes deployed, starting from $0.35 per inbox. | A dedicated RUA address, automated report processing, and 24/7 authentication analysis. Bulk sender compliance for outgoing compliance, and hosted mta-sts for incoming confidence. |
cold email, cold email inbox, warmed inboxes, google workspace inboxes, cold email infrastructure | dmarc, mta-sts, tls-rpt, aggregate, forensic, spf, dkim |
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Is an accessibility platform and WCAG accessibility checker that helps identify accessibility issues, track progress, and support documentation and remediation work for European Accessibility Act (EAA) requirements.
Developer CLI tool for AI content compliance. Stamps files with provenance metadata, audits against EU AI Act, SOX, HIPAA. Integrates with GitHub Actions, pre-commit, and MCP.

Is an AI-driven multichannel outreach platform that reaches prospects where they're most active while keeping every message personal, timely, and effective.

Is a free, open-source SMTP testing tool built with Go and Vue. It provides a modern web UI for viewing and testing emails, and includes a REST API for integration testing.

Get SOC 2, GDPR, HIPAA, and ISO certified with expert guidance and the job done for you. Open-source compliance management platform with no vendor lock-in. Backed by Y Combinator. Probo is a compliance automation platform designed to take the complexity out of cybersecurity governance, risk, and compliance (GRC). Instead of managing spreadsheets and chasing colleagues for evidence, security teams can centralize their entire compliance program in one intuitive workspace.

Free email verifier & checker to validate email addresses instantly. Reduce bounces and verify emails in real time.

Sidemail is an all-in-one email delivery platform for startups that makes sending emails simple. It has everything for delivering and managing emails – email API, transactional emails, email marketing and automation, contact management, no-code email editor, email templates, subscribe forms, and more. Perfect for teams & developers that want reliable deliverability without the bloat. We're based in the EU and GDPR compliant.

Get US-IP Google & Microsoft Workspace accounts from $2.5. 95% inbox delivery. Works with SmartLead, Instantly, Lemlist, SalesForge, Warmy & more.

Free email checker and email verification with 99.9% accuracy. Reduce bounces, protect sender reputation. 100 free email verification credits daily.

Unifies Vendor Risk Management, AI-powered Compliance, and Trust Management in one platform — automate, monitor, and stay audit-ready.