The Email Deliverability Platform For
AI Cold Email Outreach
Your AI SDR Can't Sell From The Spam Folder
Warmy is the deliverability infrastructure behind AI SDRs and AI-powered sales agents. Warm up every domain and mailbox, test inbox placement and monitor reputation, blocklists, SPF, DKIM and DMARC so your AI cold email outreach reaches potential customers, not spam.
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<25 sec
Average setup time
1M+
Real mailboxes in the warm-up network
API + MCP
Plus Zapier, Make and n8n automation
Trusted By AI-Driven Outbound Teams
What Warmy Does For AI SDR Teams
Warmy is a deliverability platform for AI SDRs and automated outbound.
It warms up every sending domain and mailbox, runs Inbox Placement Tests to show where your emails land, monitors domain and IP reputation and blocklists, verifies lists and checks SPF, DKIM and DMARC.
It's the infrastructure AI cold email outreach needs to reach the inbox, and it works under the sequencer or agent you already use.
Stop Babysitting Domains. Let Warmy Own Deliverability For You
Outbound fails on infrastructure, not on copy. Hand warm-up, placement testing, reputation and authentication to a team that does nothing else and keep your sales teams focused on the pipeline.
120+
Deliverability specialists on the Warmy team
24/7
Monitoring and alerts on your domains
70+
Integrations for B2B senders
1. It's a full-time job you didn't hire for
Warm-up curves, DNS records, blocklists, reputation dips. Keeping outbound in the inbox eats days every month from people who should be booking meetings.
2. We already run the hard part
Warmy warms every new mailbox inside a 1M+ warm-up network, runs Inbox Placement Tests, verifies your lists and watches reputation and SPF/DKIM/DMARC, so your team just keeps sending.
3. You get an expert, not a dashboard to learn
Every account has a dedicated deliverability expert, and Adeline, our AI email deliverability agent, reads your data, finds issues and tells you what to fix. No steep learning curve for new teams, and full API and webhook access for more experienced marketers.
One Deliverability Platform Under
Every AI Sales Agent
Warmy runs underneath whatever sequencer, AI SDR or cold outreach platform you already use. It doesn't write or send your outreach. It makes sure mailbox providers trust the domain when your agent hits send.
1. Warm up every mailbox
Mailboxes in Warmy's network of 1M+ real Google Workspace, Microsoft 365 and consumer inboxes open your emails, reply and move them out of spam, building trust on each new domain before your agent starts prospecting. Warm-up runs during working hours in the recipient's time zone, and Warm-Up with Clicks adds scrolling and link clicks for emails that carry links, like meeting invites.
2. Test inbox placement
Run an Inbox Placement Test on your real template before you scale a sequence. See whether it lands in the primary inbox, promotions or spam, or goes missing, at each provider.
3. Monitor reputation and blocklists
Domain and IP reputation, blacklist checks and Google Postmaster data side by side, with alerts the moment a sending domain slips.
4. Monitor authentication
DNS health checks and DMARC monitoring show whether SPF, DKIM and DMARC are set up and aligned on your sending domains, and what to fix when something breaks.
5. Verify lists before sending
Built-in email verification checks your lead data and flags invalid and risky addresses, so you can remove them before they enter a sequence without the extra cost of a separate vendor.
6. Fix content before it ships
The Templates AI optimizer scores your copy and rewrites the parts most likely to trip spam filters, while Adeline finds issues and tells you what to fix.
Get a deliverability plan built around your agent's sending volume and mailbox rotation.
Your AI Writes The Emails. Warmy Gets Them Delivered.
Copy is the easy part now. Cold email AI tools can research an account and turn one brief into hundreds of tailored messages in minutes. None of that decides whether a message is seen, because mailbox providers judge the domain and mailbox first.
Your AI SDR stack handles the message
- AI writing tools create personalized emails from your ICP, research and AI variables
- An AI writing assistant drafts replies and objection handling
- An AI sequence generator turns one brief into complete email sequences
- Your sequencer runs campaign creation, scheduling and reply management
- Multichannel campaigns add LinkedIn and calls around email
Warmy handles the inbox
- Warm-up for every new domain and mailbox, before and during sending
- Inbox Placement Tests before you scale a sequence
- Reputation, blocklist and DMARC monitoring with alerts
- List verification before contacts enter a sequence
- A dedicated deliverability expert and Adeline on hand when something slips
Even the best AI-written copy can't recover from a domain the inbox doesn't trust. A personalized cold email in spam is still unread. Warmy helps you turn personalized outreach into conversations with your target audience.
Every AI SDR Touch Actually Delivered
Every step of automated sales outreach depends on inbox delivery. Warmy protects all of them.
First-touch prospecting
A cold outreach email only gets opened if it comes from a trusted domain. Warm-up and Inbox Placement Tests give your agent’s first message a real chance of being seen.
Multi-step follow-ups
Many replies come in steps two to five. Consistent placement keeps every follow-up landing in the inbox, not just the first email.
Mailbox rotation at scale
Rotating across dozens of inboxes only helps if each one is warmed, authenticated and monitored. Warmy keeps the whole pool healthy and flags a weak mailbox before it drags down the rest.
Meeting booking and handoff
Scheduling links, confirmations and human handoffs are where more deals get won. They can't sit in spam folders.
Choosing Cold Email Tools? Check What The Warm-Up Actually Covers
Warm-up is one of the key selling points of most cold email software, and pricing pages show it. Unlimited email warm-up is a standard promise.
Some tools offer unlimited mailboxes, others call them unlimited email accounts, and many add unlimited contacts on top.
Those promises matter less than what sits behind them: who your mailboxes warm up with, and whether you can see where your mail actually lands.
| Built-in warm-up in a sequencer | Warmy deliverability platform | |
|---|---|---|
| Warm-up network | Often a peer pool made up of the tool's own users | 1M+ real Google Workspace, Microsoft 365 and consumer mailboxes |
| Inbox placement testing | Often not included | Inbox Placement Tests at each provider: inbox, promotions, spam or missing |
| Reputation and blocklists | Often not tracked | Domain and IP reputation, blacklist alerts and Google Postmaster data |
| Authentication | One-time DNS check at setup, if any | DNS health checks and DMARC monitoring with fix guidance |
| List verification | Usually handled by external tools | Built into the platform |
| AI | An AI feature for writing copy, often paid for with AI credits | Adeline reads your data, finds issues and tells you what to fix |
| Human help | Often help docs and a ticket queue | A dedicated deliverability expert on every account, plus Slack, WhatsApp and Teams support |
| Coverage | Only mailboxes connected to that one tool | Every domain and mailbox, whichever of your AI email tools or ESPs sends |
Keep the sequencer you like. Warmy adds all the tools that protect the inbox underneath it, in one platform.
What Better
Cold Email Deliverability Is Worth
Deliverability multiplies everything else. When more of each sequence reaches the inbox, response rates and overall email performance follow.
2.3×
Higher open rates
95%
Inbox placement
−35%
Lower bounce rates
Illustrative example based on typical lift. Actual results depend on list quality, content and sending history.
Deliverability For Outbound Teams Of Any Company Size
Founders and small businesses
Sending outbound yourself? Connect a mailbox, let warm-up and monitoring run in the background, and get a plain answer from Adeline or your dedicated expert when something slips.
Medium-sized businesses
SDR teams running AI agents across dozens of mailboxes get per-domain warm-up, Inbox Placement Tests before new sequences go live and alerts the moment a domain or IP starts to slip.
Agencies and platforms
Manage multiple inboxes across client accounts from one place, or build Warmy into your own product through the API. Outreach platforms and ESPs already run their warm-up on it.
I've already gotten a handful of legit meetings from Warmy based just on cold emails, and the messaging hasn't changed much from what we were using before.
Jesse Vogt, Director of Business Development
Frequently Asked
Questions
It's the share of your cold emails that reach the inbox instead of spam or nowhere. It depends on your domain and mailbox reputation, SPF, DKIM and DMARC, list quality, sending volume and how recipients engage. For AI SDRs it matters even more, because agents send at higher volume from newer domains.
Mostly because of sending patterns, not copy. AI agents ramp volume much faster than a human rep, usually from new domains and mailboxes with no history. Mailbox providers judge volume, authentication, bounces and complaints before anyone reads your subject lines. Warmed-up domains, correct SPF/DKIM/DMARC, verified lists and a controlled ramp change the outcome.
No. Warmy doesn't write or send outreach. Whether your agent runs on a dedicated AI SDR product, an in-house build or a sales engagement platform, Warmy works underneath it at the domain and mailbox level: warming up, testing placement and monitoring reputation so your agent's emails reach the inbox.
Plan for roughly two to four weeks before a new mailbox sends automated cold emails at full volume, then keep warm-up running while the agent sends. Ramp gradually and run an Inbox Placement Test to confirm inbox delivery before you scale. Warmy's free Warm-Up Volume Calculator helps you size the ramp.
Yes. Warmy is built for cold email automation at scale. Connect dozens of mailboxes across domains, and each one gets its own warm-up schedule and health data, with alerts when a domain or IP slips. Plans scale with your warm-up volume, and custom plans cover larger rotations. Teams can connect and launch mailboxes in bulk through the Warmy API, check sender health from MCP-ready AI agents, and automate workflows with Zapier, Make or n8n.
Run an Inbox Placement Test on your actual template before you scale outreach campaigns. It shows where the email lands at each provider (inbox, promotions, spam or missing) across Gmail, Outlook, Yahoo and business providers. If placement is weak, fix it first, then scale. You can also run a quick check with the free deliverability test.
Yes. You can connect Google Workspace, Microsoft 365 and any SMTP/IMAP mailbox in a few clicks, and the average setup takes under 25 seconds. Warm-up runs inside a network that includes real Workspace and Microsoft 365 business inboxes, which matters for B2B outbound aimed at corporate mail.
Keep volume predictable, warm up every new mailbox, isolate experiments on separate domains and verify lists before sending. Then monitor continuously: Warmy tracks domain and IP reputation, blocklists and Google Postmaster data, and alerts you when a signal drops so you can pause the affected mailbox before it hurts the rest.
Start with clean data. Many listings are triggered by spam traps and invalid addresses, so verify every contact before it enters a sequence, whichever lead database it came from. Keep bounce and complaint rates low and avoid sudden volume spikes. Warmy checks major blocklists continuously and alerts you the moment a domain or IP is listed.
Yes. Gmail, Yahoo and Microsoft require SPF, DKIM and DMARC from bulk senders (roughly 5,000+ emails a day), and missing or misaligned records are one of the most common reasons new outbound domains land in spam. Warmy's DNS health checks and DMARC monitoring show what needs fixing.
Indirectly, yes. An email that never reaches the inbox can't get a reply. Teams typically see better results from cold email campaigns once domains are warmed, authenticated and monitored, because more of every sequence is actually seen. Actual results depend on your list, copy and sending history.
No. Warmy's platform isn't an AI email writing product or one of the many cold email generators. Your agent or AI assistant writes the copy, and Warmy makes sure it's delivered. Before you send, the Templates AI optimizer checks cold email templates for patterns that hurt placement.
Warmy works with any sending platform, from AI SDR agents and sequencers to ESPs, email outreach tools and other tools in your stack. Connect directly (Google Workspace, Microsoft 365, any SMTP/IMAP mailbox, or platforms like Outreach, Apollo.io, ZoomInfo, HubSpot and GoHighLevel), through the API with n8n, Zapier or Make, or with a Seed List added to your own ESP when a platform can't be connected directly. Warmy offers 70+ integrations for B2B senders.
Paid plans start at $49 per month, and there’s no free plan. Warm-up volume, the number of Inbox Placement Tests and DNS checks, and some warm-up settings grow with each plan. To compare them, start a 7-day free trial with no credit card required: every plan and price is visible in your dashboard after sign-up.
No. Warm-up is one part of the platform. It builds trust on a new domain or mailbox through real engagement with your emails. Deliverability is the whole picture: authentication, domain and IP reputation, blocklists, list quality and where your mail actually lands. Warmy covers all of it in one platform, with a dedicated expert on every account.
Usually, yes. Sending outbound from secondary domains protects your main domain if something goes wrong. Each new domain still needs SPF, DKIM and DMARC, warm-up and monitoring before your agent scales up.
It depends on domain age, warm-up history and the mailbox provider, so there's no single safe number. Ramp each mailbox gradually and add mailboxes as your agent scales instead of pushing more volume through each one. Warmy's free Mailbox Calculator helps you plan how many mailboxes your daily volume needs.
AI agents changed how fast outbound can move. They didn't change how Gmail, Outlook and Yahoo decide who gets into the inbox.
Warmy is the platform that keeps up: continuous warm-up, inbox placement testing, reputation and blocklist monitoring and authentication checks across every domain and mailbox. It's built by 120+ deliverability specialists and backed by artificial intelligence that reads your data, finds issues and tells you what to fix, tuned for the sending patterns AI sales agents actually run.
Book a Demo
Give Your AI Agents An Inbox To Land In
Book a 30-minute call. Share a few key details (mailbox count, domains, daily volume) and we'll map your deliverability pain points and walk you through a plan to fix them, step by step. We promise you the best support you've ever had.
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