The largest open-source B2B cold outreach and email warmup service.
Spoofy is a program that checks if a list of domains can be spoofed based on SPF and DMARC records.
Email marketing skill for Claude Code. 88K words, 908 sources, 19 industry playbooks. Install the skill and Claude becomes your email marketing expert.
The open-source Amazon SES replacement. Built in Rust.
Obtain an email full profile including reputation, consistency, deliverability, social networks account linked, plus more data points.
A Resend-compatible email platform on Cloudflare Workers — transactional sending, broadcasts, automations, inbound mail and deliverability analytics. MIT, one-click deployable into your own account.
📧 Never end in spam with the world's most comprehensive email deliverability checklist
The send half of OpenOutreach: reads qualified leads on stdin (outfind find --json | outsend), persists them to its own store, and sends on its own clock.
SocketLabs Email Delivery Python Client Library
Open-source transactional email in Rust. Self-host it or use the EU cloud. SMTP and HTTP APIs, DKIM/SPF, inbound routing, webhooks, tracking, and a full dashboard.
SocketLabs Email Delivery PHP Client Library
SocketLabs Email Delivery .NET Client Library
Magento2 - Brevo (formerly Sendinblue) Integration Module
SendX's best practices for message performance, email sending deliverability and compliance.
Self-hosted email list verifier — syntax, MX, disposable detection, and polite SMTP mailbox probing with catch-all detection. pip install listwash
SocketLabs Email Delivery Node.js client library
Complete CLI and MCP server for Smartlead — 270+ commands, reverse-engineered internal endpoints, and Claude Code skills. Built by GTM engineers, free for the community.
Recipient-side control for cold email: classify the mail gateway behind each recipient, isolate gateway cohorts, and throttle per-account exposure before launch. Exports a rollout plan; never sends.
Gmail Postmaster Tools (v2 API) as an MCP server — domains, traffic metrics & sender compliance in Claude, Cursor, and any MCP client. Bring your own Google OAuth. Zero dependencies.
Outlook.com SNDS (Smart Network Data Services) as an MCP server — OAuth sign-in, IP Data & IP Status reports in Claude, Cursor, and any MCP client. Zero dependencies.
To associate your repository with the deliverability topic, visit your repo's landing page and select "manage topics."