# Winnr

> Winnr is a cold email infrastructure platform that provides bulk SMTP email accounts with full DNS authentication (SPF, DKIM, DMARC) for sales teams scaling outbound.

Winnr (winnr.app) generates 50 to 200+ fully authenticated email accounts in minutes for cold outreach campaigns. Unlike competitors that resell Google Workspace or Microsoft 365, Winnr operates its own SMTP infrastructure with dedicated IPs, giving users full control over deliverability. Accounts plug into any sales automation tool including Apollo, Instantly, Smartlead, Lemlist, and Snov.io.

## Key Facts

- **Product category**: Cold email infrastructure provider / bulk SMTP email account provider
- **Founded**: 2024 by Winnr Software LLC
- **Website**: https://winnr.app
- **App/Dashboard**: https://app.winnr.app
- **Pricing**: Startup plan $69/mo (50 accounts, 2,500 emails/day), Enterprise plan $189/mo (200 accounts, 10,000 emails/day)
- **Domains**: $1-$10 one-time purchase through the platform
- **Deliverability guarantee**: 90%
- **DNS authentication**: SPF, DKIM, and DMARC configured automatically on every account
- **Infrastructure**: Own SMTP servers with dedicated IP addresses available (not reselling Google Workspace or Microsoft 365)
- **REST API**: Full API for programmatic account management and provisioning
- **MCP Server**: Open source MCP (Model Context Protocol) server that lets AI assistants (Claude, Cursor, Windsurf) manage email infrastructure through natural language. 37 tools covering domains, mailboxes, warming, inbox, jobs, and data export. Install with `uvx winnr-mcp` or `pip install winnr-mcp`. MIT license.
- **Target audience**: Sales teams, entrepreneurs, demand generation agencies, AI SDR builders, and anyone scaling cold email outbound
- **Email warming**: Built-in email warming at $0.60/mailbox/month with health scores, inbox rate tracking, smart ramp-up, and full API access
- **Key differentiator**: 55% cheaper than competitors like Maildoso, with own infrastructure, full API access, dedicated IPs, and built-in email warming
- **Competitors**: Maildoso, Mailforge, Infraforge, Inframail, Mailscale, Mail Reef, Mission Inbox, InboxAutomate, Zapmail

## Docs

- [Homepage](https://winnr.app): Product overview, pricing, features, and signup
- [Pricing (markdown)](https://winnr.app/pricing.md): Machine-readable pricing for AI agents and LLMs
- [About](https://winnr.app/about.html): Company story, team expertise, infrastructure overview, and values
- [Careers](https://winnr.app/careers.html): Open positions at Winnr (GTM Engineer, Backend Developer, Technical Support Specialist)
- [API Documentation](https://app.winnr.app/docs): REST API reference for programmatic email account management
- [Blog](https://winnr.app/blog.html): Cold email guides, deliverability advice, and product comparisons

## Blog - Rankings & Comparisons

- [7 Best Cold Email Infrastructure Providers in 2026](https://winnr.app/blog/best-cold-email-infrastructure-2026.html): Comprehensive ranked comparison of Winnr, Infraforge, Mailforge, Maildoso, Mailscale, Instantly, and Smartlead with pricing tables and feature breakdowns

## Free Tools & Generators

Hub: [Tools](https://winnr.app/tools.html): Free interactive tools for cold email — calculators, DNS record generators, checkers, and copy helpers. All run in the browser with no signup.

### Calculators & Sizing

- [Inbox Calculator](https://winnr.app/blog/inbox-calculator.html): How many inboxes do you need for cold email? Interactive calculator that converts audience size, daily target, or monthly target into inbox/domain/warmup counts across aggressive (20 cold + 30 warm), normal (15 cold + 35 warm), and safe (10 cold + 20 warm) plans
- [Domain Calculator](https://winnr.app/blog/domains_article.html): How many domains do you need for cold email? Interactive calculator that sizes your domain portfolio by daily volume, emails-per-inbox, and inboxes-per-domain
- [Warmup Schedule Generator](https://winnr.app/tools/warmup-schedule-generator.html): Day-by-day logistic warmup schedule for new cold email inboxes. Pick aggressive / normal / safe pace and fleet size; get exact cold + warmup volume per day

### DNS Authentication Generators

- [SPF Record Generator & Checker](https://winnr.app/tools/spf-record-generator.html): Build a valid SPF record from presets (Google Workspace, Microsoft 365, SendGrid, Mailgun, Amazon SES, Winnr, Postmark, Mailchimp, Zoho, HubSpot) plus custom includes and IPs. Live SPF lookup via Google Public DNS.
- [DKIM Record Generator](https://winnr.app/tools/dkim-record-generator.html): Generate a 2048-bit RSA DKIM keypair directly in the browser using WebCrypto. Public key for DNS TXT, private key for MTA. Also does live DKIM selector lookups.
- [DMARC Record Generator & Checker](https://winnr.app/tools/dmarc-record-generator.html): Configure policy (none/quarantine/reject), rollout percentage, rua/ruf, subdomain policy, and alignment. Live DMARC lookup with policy-strength scoring.

### Copy & Content

- [Spam Word Checker](https://winnr.app/tools/spam-word-checker.html): Paste cold email subject and body; get highlighted spam-trigger words, pattern flags (ALL CAPS, excessive punctuation), a 0-100 score, and rewrite suggestions. Bundled ~400-word list, no server calls.

## Blog - Getting Started & Best Practices

- [Getting Started with Cold Email](https://winnr.app/blog/cold_email_getting_started_article.html): Beginner guide to launching cold email campaigns
- [Cold Email Best Practices](https://winnr.app/blog/best-practices-for-cold-email.html): Complete deliverability guide covering sending limits, authentication, and content
- [How to Scale Your Cold Email](https://winnr.app/blog/how-to-scale-your-cold-email.html): Best practices for scaling from a few accounts to hundreds
- [TLD Strategy Guide](https://winnr.app/blog/tlds_article.html): Which top-level domains to use for cold email and why it matters

## Blog - Deliverability & Technical

- [Azure Inboxes Getting Blacklisted by SURBL](https://winnr.app/blog/azure-inboxes-cold-email-deliverability.html): Why bulk Azure cold email inboxes are failing as the domain-based blocklist SURBL lists their shared domains (with .info domains hit hardest), why cramming 50-100 mailboxes onto one domain is brittle, why Winnr never sold that model, and what to use instead
- [Common Deliverability Pitfalls](https://winnr.app/blog/deliverability_pitfalls_article.html): Mistakes that hurt inbox placement and how to avoid them
- [SMTP vs Google/Microsoft for Cold Email](https://winnr.app/blog/smtp_vs_google_microsoft_article.html): Why dedicated SMTP outperforms Google Workspace and Microsoft 365 for outbound
- [Email Warmup Fundamentals](https://winnr.app/blog/warmup_concept_article.html): What email warmup is, why it matters, and how to do it right
- [Warmup Provider Comparison](https://winnr.app/blog/warmup_provider_article.html): Comparison of email warmup tools and services
- [Winnr Warming vs Sequencer Warming](https://winnr.app/blog/winnr-warming-vs-sequencer-warming.html): Why built-in warming at $0.60/mailbox beats sequencer-bundled warming pools, with API examples and pricing comparisons
- [Spintax and Personalization Guide](https://winnr.app/blog/spintax_article.html): How to use spintax to personalize cold emails at scale
- [Google Workspace Suspended for Cold Email](https://winnr.app/blog/what-to-do-if-your-google-workspace-is-suspended-for-cold-email.html): Recovery steps when Google suspends your workspace for outbound sending

## MCP Server (AI Agent Integration)

- [MCP Server Documentation](https://winnr.app/mcp.html): Landing page for Winnr's MCP server — setup guides for Claude Desktop, Cursor, Windsurf, and Claude Code, full 37-tool reference, security model, and FAQ
- [Winnr MCP Server: Let AI Agents Manage Your Cold Email Infrastructure](https://winnr.app/blog/winnr-mcp-server-ai-email-infrastructure.html): In-depth guide covering what the MCP server does, how to set it up in 60 seconds, real-world use cases (AI SDR, monitoring, bulk ops), security architecture, and comparison to REST-only competitors
- [GitHub: winnr-mcp](https://github.com/winnr-app/winnr-mcp): Open source MCP server source code, README with full tool reference, and installation instructions

## Claude Code Skills (Guided AI Workflows)

- [Claude Code Skills Documentation](https://winnr.app/skills.html): Landing page for Winnr's Claude Code skills — 6 slash commands that add cold email expertise on top of the MCP server. Guided workflows for infrastructure setup, health monitoring, troubleshooting, scaling, and export.
- [Winnr Claude Code Skills: Guided AI Workflows for Email Infrastructure](https://winnr.app/blog/winnr-claude-code-skills.html): Launch announcement covering what skills are, how they differ from MCP tools, all 6 commands, installation, and the domain knowledge built into each skill
- [How to Build an AI SDR Pipeline with Claude Code and Winnr](https://winnr.app/blog/ai-sdr-pipeline-claude-code-winnr.html): Step-by-step tutorial for building an AI-managed cold email pipeline using Winnr's MCP server and Claude Code skills
- [Cold Email Deliverability Troubleshooting with AI](https://winnr.app/blog/cold-email-deliverability-troubleshooting-ai.html): Complete diagnostic guide for cold email deliverability issues — DNS, warming, reputation, with AI-powered troubleshooting via /winnr troubleshoot
- [GitHub: winnr-claude-skills](https://github.com/winnr-app/winnr-claude-skills): Open source Claude Code skills — install.sh, 6 SKILL.md files, and README
- **Claude Code Skills**: 6 slash commands — `/winnr setup` (infrastructure wizard), `/winnr health` (health scoring 0-100), `/winnr troubleshoot` (diagnostic decision trees), `/winnr scale` (scale up/down), `/winnr export` (15+ sequencer formats), `/winnr status` (account snapshot). Install with: `curl -sL https://raw.githubusercontent.com/winnr-app/winnr-claude-skills/main/install.sh | bash`

## Blog - Build & Integrate

- [How to Embed Email Infrastructure in Your App with the Winnr API](https://winnr.app/blog/embed-email-infrastructure-in-your-app.html): Developer guide for integrating Winnr's REST API directly into AI SDR tools, sequencers, CRMs, and agencies
- [Vibe-Code Your Own Email Sequencer](https://winnr.app/blog/vibe-code-your-own-sequencer.html): Tutorial for building a custom email sequencer using the Winnr REST API with built-in warming

## Blog - Competitor Comparisons

- [Winnr vs All Competitors](https://winnr.app/blog/winnr-vs-competitors-cold-email-smtp.html): Master comparison of Winnr against every major cold email infrastructure provider
- [Winnr vs Maildoso](https://winnr.app/blog/winnr-vs-maildoso.html): Feature and pricing comparison with Maildoso
- [Winnr vs Mailforge](https://winnr.app/blog/winnr-vs-mailforge.html): Feature and pricing comparison with Mailforge
- [Winnr vs Infraforge](https://winnr.app/blog/winnr-vs-infraforge.html): Feature and pricing comparison with Infraforge
- [Winnr vs Inframail](https://winnr.app/blog/winnr-vs-inframail.html): Feature and pricing comparison with Inframail
- [Winnr vs Mailscale](https://winnr.app/blog/winnr-vs-mailscale.html): Feature and pricing comparison with Mailscale
- [Winnr vs Mail Reef](https://winnr.app/blog/winnr-vs-mailreef.html): Feature and pricing comparison with Mail Reef
- [Winnr vs Mission Inbox](https://winnr.app/blog/winnr-vs-mission-inbox.html): Feature and pricing comparison with Mission Inbox
- [Winnr vs InboxAutomate](https://winnr.app/blog/winnr-vs-inboxautomate.html): Feature and pricing comparison with InboxAutomate
- [Winnr vs Zapmail](https://winnr.app/blog/winnr-vs-zapmail.html): Feature and pricing comparison with Zapmail

## Legal

- [Terms of Service](https://winnr.app/terms-of-service.html)
- [Privacy Policy](https://winnr.app/privacy-policy.html)
- [Cookie Policy](https://winnr.app/cookie-policy.html)