Land in the Inbox, Not the Spam FolderWarm Up Unlimited Accounts
AI-generated conversations across a peer-to-peer network of real inboxes. Industry-specific topics, intelligent slow ramp, DNS health monitoring, and an AI Deliverability Copilot — all for a flat monthly fee with unlimited mailboxes.
Three Steps to Inbox Domination
No DNS wizardry. No complex configuration. Connect, choose a strategy, and let our AI network do the heavy lifting.
Connect Your Accounts
Add unlimited email accounts via SMTP/IMAP. Google Workspace, Microsoft 365, or any provider. Takes 60 seconds per account.
Pick Your Strategy
Choose your industry and topic, select a warmup recipe (Growth, Maintenance, or Recovery), and let the AI handle the rest. Or just leave it on "General" — we'll figure it out.
Watch Your Reputation Grow
Our AI generates realistic email threads across a P2P network of real inboxes. Slow ramp protects new domains. Your AI Copilot reports progress weekly.
Everything You Need for Perfect Deliverability
Ten features powered by self-hosted AI. No per-email costs. No API rate limits. Just intelligent warmup that runs 24/7.
AI Deliverability Copilot
Get plain-English insights from your self-hosted AI. DNS health, warmup metrics, and blacklist status analyzed into actionable recommendations — automatically.
AI-Generated Conversations
Our self-hosted AI creates natural, human-like email threads — not robotic templates. Every conversation is unique, contextual, and industry-relevant.
Industry & Topic Targeting
Select your industry and topic focus for contextually authentic warmup. A real estate agent's warmup emails discuss property — not generic business fluff.
Intelligent Slow Ramp
New domains start with minimal volume and automatically increase over 2-4 weeks. Protects your reputation while building trust with email providers.
Warmup Recipes
Choose Growth, Maintenance, or Recovery presets — or go Custom. Each recipe pre-tunes volume, reply rates, and scheduling for your specific situation.
DNS Health Checks
Instant SPF, DKIM, and DMARC validation for every connected domain. Catch misconfigurations before they tank your deliverability — at zero cost.
AI Content Preview
See exactly what your warmup emails look like before starting. No black boxes — full transparency into the AI conversations protecting your reputation.
Blacklist Monitoring
Continuous monitoring across major blacklists. Get alerted the moment your domain or IP appears — before it impacts your campaigns.
Smart Warmup Tuning
After 2+ weeks, the AI analyzes your metrics and suggests strategy changes. Automated intelligence that adapts to your domain's unique reputation curve.
Inbox Placement Testing
Send a test email and see exactly where it lands — Inbox, Spam, Promotions — across Google, Microsoft, and Yahoo. Per-provider breakdown, not a single score.
Unlimited Accounts. One Flat Fee.
No per-inbox charges. No credit card to start. Connect as many accounts as you want — you only pay for the daily warmup volume you need.
Free
Get started with warmup at zero cost. Perfect for testing or low-volume senders.
- Unlimited email accounts
- 50 warmup emails/day
- AI-powered conversations
- Industry & topic targeting
- Slow ramp protection
- DNS health checks (SPF/DKIM/DMARC)
- AI Content Preview
- 1 inbox placement test/mo
- Works for cold outreach & marketing email
Starter
For solopreneurs and small teams ready to scale their warmup.
- Everything in Free, plus:
- 200 warmup emails/day
- Warmup recipes (Growth / Maintenance / Recovery)
- 5 inbox placement tests/mo
- 2 blacklist monitors
- AI Deliverability Copilot
- 2 team members
Professional
Built for growing teams managing multiple domains and campaigns.
- Everything in Starter, plus:
- 800 warmup emails/day
- 20 inbox placement tests/mo
- 10 blacklist monitors
- AI Weekly Deliverability Digest
- Smart Warmup Tuning
- Priority P2P network matching
- 4 team members
- API access
Business
For agencies and enterprise teams operating at scale.
- Everything in Professional, plus:
- 2,500 warmup emails/day
- 50 inbox placement tests/mo
- 50 blacklist monitors
- 10 team members
- Priority support
- Custom warmup strategies
- Dedicated onboarding
All plans include unlimited email account connections. Daily warmup volume is shared across all connected accounts. Works for both cold outreach and email marketing warmup.
Frequently Asked Questions
Everything you need to know about email warmup and how WarmupMachines works.
Email warmup is the process of gradually building your email account's sender reputation by exchanging real emails with other accounts. When you start sending cold emails from a new or dormant domain, email providers (Gmail, Outlook, etc.) are suspicious. Warmup proves to these providers that your account is legitimate, sending real conversations to real people — which trains their algorithms to deliver your emails to the inbox instead of spam.
Every account connected to WarmupMachines joins our peer-to-peer (P2P) network. Your accounts both send and receive warmup emails from other real accounts in the network. This creates genuine email interactions — opens, reads, replies, and thread continuations — that email providers recognize as authentic human behavior. The larger the network grows, the better the warmup quality for everyone.
You can connect as many email accounts (inboxes) as you want on any plan — there are no per-inbox charges. The only limit is your daily warmup volume pool (200, 800, or 2,500 emails/day depending on your plan), which is shared across all your connected accounts. This makes WarmupMachines dramatically cheaper than per-inbox competitors like Lemwarm ($29/inbox) or Mailreach ($25/inbox).
Most warmup tools use generic templates or basic randomization. WarmupMachines runs a self-hosted AI model that generates completely unique, contextually relevant email conversations. You can choose your industry and topic focus, so your warmup emails discuss subjects that make sense for your business — a real estate agent gets warmup emails about properties, not generic business jargon.
The Copilot analyzes your DNS configuration (SPF, DKIM, DMARC), warmup metrics, and blacklist status, then generates plain-English recommendations. Instead of staring at dashboards, you get actionable advice like "Your DMARC is set to none — upgrade to quarantine to reduce spoofing risk" or "Your inbox placement improved 14% — consider reducing warmup volume to Maintenance mode."
Most accounts see significant improvement within 14-21 days. Our slow ramp feature gradually increases daily volume from a safe starting point, protecting new domains from being flagged. The AI Copilot will notify you when your account reaches a healthy reputation threshold and suggest switching to a Maintenance strategy.
Absolutely — that's the intended use case. Warmup runs in the background while you send your real outreach campaigns. In fact, deliverability experts recommend keeping warmup active at a lower volume even after your domain is fully warmed, to maintain your sender reputation over time.
Inbox Placement Testing lets you send a test email and see exactly where it lands — Primary Inbox, Spam, Promotions, or Blocked — across Gmail, Outlook, and Yahoo. Unlike a single "deliverability score," you get a per-provider breakdown so you know exactly which providers need attention. Each test also includes SPF/DKIM/DMARC checks, blacklist scans, and content analysis in one report. Free plans include 1 test per month.
WarmupMachines supports any email provider with SMTP/IMAP access — including Google Workspace, Microsoft 365, Zoho, and custom mail servers. Google/Microsoft OAuth support is planned for a future release. Simply enter your SMTP and IMAP credentials, and you're connected in 60 seconds.