Auto-generated personalized warm-up messages
No two mailboxes get the same script. We write separate conversations for each one and change the wording as we go, the way normal email changes from one message to the next.
Get 95% Inbox Placement
with Email Warm-Up
Warmy's email warm-up tool helps prepare a new mailbox for outreach. It sends emails to real inboxes in our network, where they get replies. If an email lands in spam, the receiving mailbox moves it back to the inbox. Over time, this helps build sending history and sender reputation, so your mailbox is better prepared for real campaigns. Track your inbox placement progress right from your dashboard.
No Credit Card Required | Cancel Anytime
How Email Warm-Up
Works in Warmy
To warm up an email address by hand, you'd send a few emails a day, ask colleagues to reply, and add a little more volume each week. For about a month. Warmy runs the whole email warm-up process for you. You connect the mailbox and pick your topics. We handle the rest.
1. Connect your mailbox
You can connect a mailbox on Gmail, Google Workspace, Outlook or Microsoft 365, or one that sends through SendGrid, Mailgun or Brevo. If your provider gives you SMTP access, it will connect too.
2. Adeline builds the schedule
Before sending anything, Adeline (our AI) checks the mailbox's age, its past sending and its current reputation. Those three things decide where volume starts and how quickly it climbs. You choose the topics and languages.
3. Network mailboxes open and reply
Your mailbox trades emails with real mailboxes in the Warmy network. Every email gets opened. About 30% get a reply. Anything that lands in spam is moved to the inbox, and the volume goes up a little each day.
4. Check readiness, then launch
Watch three numbers on the dashboard: mailbox temperature (how many emails go out today), inbox placement and Health Score. When placement is at 85-90% or higher, you can launch. Leave warm-up on after that. It keeps the reputation you built.
A worldwide email network
1M+
mailboxes in the network
From some of the biggest email providers in the world.
GmailGlobal
Google WorkspaceGlobal
OutlookGlobal
Microsoft 365Global
Yahoo MailGlobal
iCloud MailGlobal
WEB.DEGermany
GMXGermany
Seznam EmailCzechia
QQ MailChina
Naver MailSouth Korea
UOL MailBrazil
Automated Email Warm-Up
With AI-Written Conversations
Warmy is an email warmup service that writes the emails too. We draft and send every warm-up message and set the daily volume for each mailbox. Your team doesn't touch any of it.
Specific topic warm-up
Topics should match what you sell. A property firm might choose real estate, a SaaS company software, a staffing agency recruiting. The emails come out in whatever language your campaigns use.
Automatic archive
Your team won't see warm-up emails piling up. Warmy archives each one within 20 minutes.
Warm up your own templates
Already have outreach templates? Upload them and we'll send them as warm-up emails. Your real copy starts earning engagement weeks before launch.
Email Warm-Up That Builds
Sender Reputation
Why does reputation matter so much? Because Gmail and Outlook use your sender reputation to decide, email by email, whether you get the inbox or the spam folder. And reputation comes down to two questions. Do you send at a steady pace? Do people engage with what you send? Email warming works on both for each of your domains, before the first real campaign goes out.
Email warm-up with AI
Adeline sets each mailbox's daily volume and adjusts it to what providers are signaling. Better placement means more volume.
Safe auto settings
Warmy keeps watch over daily limits, sudden spikes and spam placement on every mailbox. You get an alert when a mailbox shows a problem, plus the change we'd recommend.
Opens, replies and importance signals
Opened. Replied to. Marked as important. Pulled out of spam when it lands there. Providers read every one of those as a sign that people want your email.
Monitoring and Insights
for Every Warmed Mailbox
Real mailboxes across providers
Every mailbox in our network is real and active. They're spread across the big providers (Gmail, Google Workspace, Outlook, Microsoft 365) and others. You decide the mix, too. Selling mostly to enterprise companies? Lean it toward Outlook.
Your dashboard and alerts
Open a mailbox to see its temperature, inbox placement by provider, Health Score and spam rate. If any of them shifts, Warmy lets you know. And when the mailbox is ready for campaigns, its status says so.
Email Providers and Global Support
Supported email providers
Gmail, Google Workspace, Outlook and Microsoft 365 all work. So do Zoho, Amazon SES, Brevo, SendGrid and Mailgun. Plus any provider with SMTP access (IMAP is optional).
Used by companies worldwide
Sales teams, agencies and marketers all over the world warm up their mailboxes, domains and IPs with Warmy.
Email warm-up in more than 30 languages
Writing to prospects in Germany? Then your mailbox needs a history in German. That's why Warmy runs email warm-up in more than 30 languages.
Customers include: Quicklizard · Motion · Awesomic · Benchmark International · UserWay · Selling.com
When Should You Warm Up
an Email Account?
Warm up a mailbox any time it's about to send more than its history can support, or when its reputation has taken a hit. The usual cases:
- New mailbox or domain.
- Warm it up before the first campaign. Every time.
- Dormant mailbox.
- No one has sent from it in weeks or months, and you want to bring it back.
- Bigger volume.
- You're about to send a lot more than you normally do.
- Deliverability recovery.
- Your emails used to reach the inbox and now they don't. Fix the cause, and then warm up.
- Switching infrastructure.
- You're moving to a new domain, subdomain, mailbox or sending provider.
What Happens During
an Email Warm-Up
Warm-up is slow on purpose. Volume rises step by step, while network mailboxes open, reply and rescue your emails from spam. What each signal does:
Gradual volume
- What Warmy does
- Starts with a handful of emails and adds more each day
- Why it matters
- Providers flag new senders whose volume jumps overnight
Opens and replies
- What Warmy does
- Network mailboxes open and answer your emails in natural threads
- Why it matters
- Regular replies show providers a real two-way conversation
Marked as important
- What Warmy does
- Network mailboxes flag some messages as important
- Why it matters
- Providers count it as positive engagement
Moved out of spam
- What Warmy does
- Network mailboxes move messages from spam to the inbox
- Why it matters
- The provider sees that the recipient wanted the message
Clicks
- What Warmy does
- Network mailboxes click links in warm-up emails
- Why it matters
- Real readers click links too
Topic and language
- What Warmy does
- Warmy writes about your industry in your audience's language
- Why it matters
- Your warm-up history looks like your real outreach
How Long Does
Email Warm-Up Take?
Give a new mailbox two to four weeks before real campaigns. The time it takes to warm up an email domain depends on how old it is, how it's been used and how much you want to send.
| Situation | Typical warm-up time | What to do |
|---|---|---|
| New domain, new mailbox | About 3 to 4 weeks | Set up SPF, DKIM and DMARC first, start at low volume, and hold campaigns until the mailbox is ready |
| New mailbox on an established domain | About 2 to 3 weeks | The domain helps, but the mailbox still needs its own history |
| Dormant mailbox | About 1 to 3 weeks | Turn warm-up back on before the first campaign |
| Moving to a new domain or provider | Same as a new mailbox, about 2 to 4 weeks | Verify your list, set up authentication, then warm up |
| Existing mailbox that lands in spam | Several weeks, depending on the cause | Fix authentication and list quality first, then warm up to recover |
| Planned volume increase | Start 1 to 2 weeks ahead | Raise warm-up first, campaign volume second |
| Mailbox already running campaigns | Ongoing | Keep warm-up on at a maintenance level |
Warmy estimates time to readiness for each mailbox. Planning volumes for a brand-new domain? The free Warm-Up Schedule Calculator can help.
Initial vs Ongoing Warm-Up
Initial warm-up
- Goal
- Build a sending history from zero
- Best for
- New and dormant mailboxes
- Volume
- Starts low, grows step by step
- When
- Before your first campaign
- What to watch
- Mailbox temperature, placement, authentication
Ongoing warm-up
- Goal
- Maintain positive engagement
- Best for
- Mailboxes already sending campaigns
- Volume
- Steady, alongside real campaigns
- When
- As long as the mailbox sends
- What to watch
- Shifts in placement and Health Score
Warm-Up Is One Part
of Deliverability
Warm-up builds reputation. It won't fix bad addresses, broken authentication or a template full of spam triggers, which is why Warmy has a separate tool for each.
Start with authentication. A broken SPF, DKIM or DMARC record will hold warm-up back, and Deliverability Insights and DMARC Monitoring catch those problems, so check them first. Then clean your list with Email Verification, because bounces hurt. Put your copy through the free Template Checker as well. Right before launch, send the real campaign to a seed list with an inbox placement test. It shows you where Gmail, Outlook and Yahoo put it.
How We Keep Your Mailbox
and Domain Safe
To warm up a mailbox, Warmy needs access to it. What we do with that access (and what we don't):
Secure connection. We connect to Google Workspace and Microsoft 365 through OAuth. Your password stays with Google or Microsoft. SMTP/IMAP passwords are kept encrypted.
Warm-up mail only. We only touch warm-up emails. Your other messages aren't read or sent.
Within provider limits. Daily volume never goes past what each provider allows.
Full control. Pause or disconnect a mailbox whenever you want.
Clean inbox. Warm-up emails get archived within 20 minutes.
Warm Up Before Your Next Campaign
Cold email teams, agencies, AI SDR platforms and e-commerce brands warm up with Warmy before major campaigns.
No credit card required
What Is an Email
Warm-Up Tool?
A mailbox that's new, or that has sat unused, starts with little or no sender reputation, and an email warm-up tool is how you build it. It trades emails with other mailboxes, sends a little more each day and gathers the opens and replies providers look for. By hand, that takes weeks. Email warmup software does it in the background while your team works on everything else.
Email, Domain and IP Warm-Up
Email (mailbox) warm-up
- What gets warmed
- The sending history of one mailbox
- Who needs it
- Anyone using a new mailbox for outreach or campaigns
Domain warm-up
- What gets warmed
- A new sending domain, via the mailboxes on it
- Who needs it
- New domains and secondary outreach domains
IP warm-up
- What gets warmed
- A dedicated sending IP address
- Who needs it
- High-volume senders on dedicated IPs
FAQFrequently Asked
Frequently Asked
Questions
It's the process of slowly raising how much a new or inactive mailbox sends, while it picks up opens and replies. Over a few weeks, Gmail, Outlook and other providers start to trust it. Send hundreds of emails from a cold mailbox on day one, and many of them will go to spam.
We start low and raise the daily volume over time. Mailboxes in our network open your emails, click and reply. Each day, Adeline revisits the schedule for every mailbox. You're free to override it with a custom one.
Providers have nothing to judge a brand-new domain or IP by, and they treat that with suspicion. Warm up first, and your first campaign goes out with a positive sender reputation behind it. That's what moves you toward the primary inbox. Sending from dedicated IPs? See Warmy's IP warm-up.
Adeline handles the scheduling. Messages are written around your topics, in 30+ languages. You get live monitoring, inbox placement by provider and a Health Score. You can also warm up your own templates, and warm-up emails are archived within 20 minutes.
Two to four weeks for most new mailboxes. Older domains with a clean record tend to be faster. Large sending plans take longer. Check the dashboard for an up-to-date estimate per mailbox.
Yes. Just upload your campaign emails. We'll mix them into warm-up so they collect opens and replies before launch. Have two versions? Run them side by side and keep the one with better inbox placement.
The effects build over time. More of your mail lands in spam each week, and every campaign that ends up there takes another bite out of your sender reputation. Repairing that takes far longer than a warm-up would have.
Yes. Cold outreach has low open rates even when it's done well, and a few recipients will click "spam." Over weeks, that adds up. Warm-up running in the background keeps adding opens and replies to balance it out.
Yes. The risky part is volume: too much, too soon, or over a provider's limits. We avoid both by raising volume in small steps. Warmy sets that pace for every mailbox and slows things down by itself if something looks wrong.
Partly. Warm-up can't remove the cause on its own. Look at authentication, list quality and content. Once those are in order, turn warm-up back on. Engagement usually recovers over a few weeks.
Some cold email platforms include basic warm-up in their plans. Warmy goes further, with inbox placement tracking, monitoring and the rest of our deliverability tools. There's a 7-day trial with full access, and you won't be asked for a card.
No. Authentication, list quality, content and the way people respond to your real campaigns all affect placement too. So instead of promising a number, Warmy shows you placement by provider.
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