The largest open-source B2B cold outreach and email warmup service.
Self-hosted inbox warm-up for cold-email senders. BYO seed pool — your domains exchange real-looking emails to build sender reputation before your first cold campaign.
Claude skill for email warmup: warm a new sending domain so mail stops landing in spam. Audits SPF/DKIM/DMARC, fixes the records where they actually live, then sends and replies on a daily ramp with Gmail, Outlook and AOL drivers.
Top Email Warmup 🌟 Star if you like it! 🌟
Tested Python CLI for email deliverability: grade SPF/DKIM/DMARC/BIMI/MTA-STS, score spam risk, gate sends with a pre-send QA check, diagnose headers, classify bounces, check blocklists, plan warmup. JSON output + Claude Code skill.
Open-source email warmer for Gmail and IMAP. Warm a mesh of owned mailboxes before campaigns.
🩺 Free, read-only cold-email deliverability auditor for Claude Code — diagnose spam placement, bounces, warmup, DNS/DMARC and IP issues across Smartlead, Instantly, PlusVibe, SendKit, EmailBison, IMAP & DNS. Nothing changed, nothing to break.
Open-source cold email deliverability toolkit with domain warmup scheduling, suppression lists, and CASL/CAN-SPAM compliance automation
Build your own self-hosted email warmup + cold-email deliverability stack (BillionMail + a Gmail-inbox warmup loop via the Gmail API). The whole methodology, ~$45/yr vs $360–1200/yr for Instantly/Smartlead. MIT.
Official Warmerly plugin for Claude: cold email outreach, deliverability and reply triage over MCP
⚡ AI-native email warmup & inbound lead intelligence platform — Next.js 15 frontend
Self-hosted, open-core cold-email & outbound-sending engine — deliverability guardrails, mailbox rotation, and reply handling built in.
Smartlead — independent third-party profile of a public API surface, by API Evangelist. Smartlead is cold email infrastructure for outbound sales and lead generation, focused on inbox deliverability through unlimited mailbox rotation, automated warmup, and a unified master inbox.
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