Email Deliverability Platform

Part of the worlds-biggest-software-project initiative.

An AI-native, open-source platform for sender reputation monitoring, warm-up automation, and inbox placement testing.

The Email Deliverability Platform helps senders get email into the inbox rather than the spam folder. It is built for sales teams, email marketers, marketing operations engineers, and agencies who need authentication monitoring, warm-up, and placement testing without paying enterprise prices or accepting the limited feature sets of bundled cold-email tools.

Why Email Deliverability Platform?

Authentication is now mandatory: Google and Yahoo enforced SPF/DKIM/DMARC and one-click unsubscribe for bulk senders in February 2024, and Microsoft followed in May 2025 — yet 75–80% of domains with a published DMARC record still fail to reach enforcement level (Valimail, 2024).
Global average inbox placement is only 83.5%, with disciplined senders reaching above 90% (Validity, 2025) — a measurable gap that better tooling can close.
Incumbent pricing is fragmented and expensive: warm-up tools start at $10–$30/month, mid-tier monitoring (MXToolbox Delivery Center) runs $129–$399/month, and enterprise suites (Validity Everest) typically cost $500–$2,000+/month.
Existing tools split the problem across categories: MailReach and Lemwarm focus on warm-up, GlockApps on testing, MXToolbox on DNS authentication, and Validity on enterprise monitoring — leaving SMBs and mid-market teams to stitch together multiple subscriptions.
Most warm-up engines still rely on static volume ramp schedules rather than adapting to real-time engagement, bounce, and spam-trap signals.

Key Features

Reputation Building and Warm-Up

Email warm-up engine that builds reputation via a network of real or simulated inboxes
Customizable warm-up schedules including emails-per-day and ramp-up increments
Multi-provider support for Gmail, Outlook, Yahoo, AOL, and custom SMTP servers
Sender rotation across multiple accounts to distribute sending load safely

Inbox Placement Testing

Seed-inbox network for verifying Inbox vs. Spam vs. Promotions placement across major ISPs
Placement breakdown by folder rather than a simple inbox/spam binary
Multi-filter spam simulation across engines such as SpamAssassin, Barracuda, and Google
Content analysis covering message size, image counts, URL reputation, and HTML compliance

Authentication and Domain Health

SPF, DKIM, and DMARC record validation and ongoing compliance monitoring
BIMI support and configuration
Domain and IP reputation checks with blacklist monitoring
Unified domain health aggregation across all mailboxes and domains in a workspace

Pre-Send Risk Analysis

Spam content analysis detecting trigger words, formatting patterns, and link characteristics
Pre-send sequence scoring that flags deliverability risks before any email is sent
Email validation to verify recipient validity and engagement potential before campaign execution

Dashboards and Alerting

Visual placement trends and health indicators over time
Configurable alerts for reputation changes and authentication failures
Actionable item lists highlighting specific deliverability issues per mailbox

AI-Native Advantage

AI shifts deliverability tooling from reactive diagnostics to forward-looking guidance. Adaptive warm-up scheduling adjusts sending volume in real time based on engagement and spam-trap signals, replacing static ramp curves. Content risk classifiers analyse outgoing copy at composition time, catching deliverability problems before send. Predictive sender-reputation models forecast future inbox placement from current behaviour, and automated DMARC progression guides domains safely from p=none to p=reject — addressing the 75–80% of domains that stall at p=none today. Cross-client ISP pattern recognition over platform-level data can flag emerging filter changes at Gmail, Outlook, or Yahoo before any individual sender's metrics degrade.

Tech Stack & Deployment

The platform is expected to support multi-provider email infrastructure (Gmail, Outlook, Yahoo, AOL, and custom SMTP), DNS-level integration for SPF/DKIM/DMARC/BIMI record management, and seed-inbox networks for placement testing. Relevant standards include SPF, DKIM, DMARC, BIMI, RFC 5321/5322, and one-click unsubscribe (RFC 8058). Deployment modes and SDK details are not yet specified; the open-source reference tools surveyed (MailHog, MailSlurp, both MIT-licensed) demonstrate viable patterns for local SMTP capture and API-driven inbox testing.

Market Context

The global email deliverability tools market was valued at approximately USD 1.2–1.6 billion in 2024–2025 and is projected to reach USD 1.9 billion by 2030 (CAGR 8.3%), with some estimates extending to USD 3.6 billion by 2034 (Research and Markets, 2025). Incumbent pricing ranges from $10–$30/month for entry-level warm-up to $500–$2,000+/month for enterprise suites. Primary buyers are sales development representatives, email marketing managers at B2C brands, marketing operations engineers, and agencies managing email infrastructure for multiple clients.

Project Status

This project is in the research and specification phase.
Contributions, feedback, and domain expertise are welcome.

Contributing

We welcome contributions from developers, domain experts, and potential users. See CONTRIBUTING.md for guidelines.

Important: All contributions must be your own original work or clearly attributed open-source material with a compatible licence. Copyright infringement and licence violations will not be tolerated and will result in immediate removal of the offending contribution. If you are unsure whether a piece of code, text, or other material is safe to contribute, open an issue and ask before submitting.

Licence

Licence to be determined. See discussion for context.