01
Connect a mailbox
Connect Gmail or Google Workspace with an app password, or Microsoft 365 with sign-in. Or let Warmerly host them with OneMail: mailboxes we set up and start warming for you.
Warmerly
Email warmup and cold email
Cold mailboxes,
warmed up.
Warm your Gmail and Microsoft 365 mailboxes with real threaded conversations, then send cold email that lands. One flat rate, no per-inbox fees, from $19 a month.
Free plan: 1 mailbox · paid plans: unmetered sending
warmerly · overview
Works with
Plugs into the inboxes you already run.
Connect Google Workspace or Microsoft 365 mailboxes in a couple of clicks. Test placement at the providers your buyers read on. Connect ChatGPT or Claude through the MCP server.
ConnectConnect and warm
Google WorkspaceGmailMicrosoft 365OutlookExchange Online
Test placementSeed inboxes at
GmailOutlookYahoo Mail
Use it fromApps and assistants
Android app (coming)ChatGPTClaude
Names and logos belong to their owners and are shown to describe compatibility, not endorsement.
See it in one short film.
Warm your mailboxes first, then send campaigns that pass their checks before anything goes out.
How it works
Warm first. Then send.
Connect a mailbox and Warmerly builds its reputation with real conversations every day. When it's warm, your campaigns go out from it, inside the limits warmup has earned.
02
Let it warm
Daily volume starts small and grows each day. Real threads, spam rescue and daily DNS checks run on their own.
Day 04 a day
Day 1425 a day
Day 3050 a day
03
Send cold email
Build a sequence and launch it from warmed mailboxes. Launch checks run first and block a send that would go out broken.
Pre-launch checks
Every merge tag exists in your leads
Unsubscribe link in place
No spam-trigger words
Senders on one domain6 on one domain
Leads queued
+ more checks passed
ColdWarmingWarmReady
A new mailbox has no history, so providers have nothing to trust. Every dot starts grey.
Why it works Reputation
Spam is a reputation problem.
Reputation is built one reply at a time.
Gmail and Outlook decide where a message lands from what the mailbox has done before. A mailbox with no history gets no benefit of the doubt. Warmup gives it a history worth trusting.
The product
Warmup and cold email in one calm app.
MailboxesRampCampaignsInbox
01 · Mailboxes
Every mailbox, one row.
Warmth as a dot W, today's sends against today's limit, and SPF, DKIM and DMARC status. Pause or resume with one switch.
- Google Workspace, Microsoft 365, hosted
- Per-mailbox authentication badges
- Reconnect prompts when a sign-in expires
02 · Ramp
A ramp you can read.
The preview shows thirty days of volume, dot by dot, so you know what will go out and when.
- Spam rescue and send-time jitter
- Lighter weekend pace if you want it
- Auto-pause if placement tests drop
03 · Campaigns
Send from warm mailboxes.
Campaigns, sequences and the checks that run before launch, side by side. If a free mailbox is still warming, you're told before anything goes out.
- Steps and waits in one sequence
- Pre-launch checks
- Advice that stays quiet when all is well
04 · Inbox
Everyone who replied, in one queue.
Replies from every mailbox in one list, sorted as interested, not relevant or spam, with a suggested reply.
- One queue across all mailboxes
- Interested, not relevant and spam labels
- Mark as done to clear the queue
warmerly · mailboxes
01 · Mailboxes
Every mailbox, one row.
Warmth as a dot W, today's sends against today's limit, and SPF, DKIM and DMARC status. Pause or resume with one switch.
- Google Workspace, Microsoft 365, hosted
- Per-mailbox authentication badges
- Reconnect prompts when a sign-in expires
warmerly · mailboxes
02 · Ramp
A ramp you can read.
The preview shows thirty days of volume, dot by dot, so you know what will go out and when.
- Spam rescue and send-time jitter
- Lighter weekend pace if you want it
- Auto-pause if placement tests drop
warmerly · warmup
03 · Campaigns
Send from warm mailboxes.
Campaigns, sequences and the checks that run before launch, side by side. If a free mailbox is still warming, you're told before anything goes out.
- Steps and waits in one sequence
- Pre-launch checks
- Advice that stays quiet when all is well
warmerly · campaigns
04 · Inbox
Everyone who replied, in one queue.
Replies from every mailbox in one list, sorted as interested, not relevant or spam, with a suggested reply.
- One queue across all mailboxes
- Interested, not relevant and spam labels
- Mark as done to clear the queue
warmerly · inbox
warmerly
04 Reputation
Warmup earns the reputation. Campaigns spend it, inside the limits it set.
Warmup
What warmup actually does.
No shortcuts. The things done every day that make a mailbox look like what it is: a real person who sends real email. Then the checks that tell you it'll land.
Warmflow
Real threaded conversations
Your mailbox writes to a network of other mailboxes, including well-aged ones, and they write back. Replies quote the message before, the way people email, so providers see a live conversation, not a blast.
sam@outreach-yourco.com09:14
Quick one before Thursday: are we still on for the Q3 planning notes? Happy to send a draft first.priya@northlane.studio09:52
Yes, send the draft over. Thursday afternoon works.> Happy to send a draft first.
sam@outreach-yourco.com10:03
Attached. Shout if anything's missing.> Thursday afternoon works.
Thread
Spam rescue
Pulled out of spam
If a warmup email lands in spam, the receiving mailbox moves it to the inbox. Providers learn that people want your mail.
Spam1
Re: Q3 planning notessam@outreach-yourco.com
Inbox2
Invoice questionalex@outreach-yourco.com
Thursday worksjo@tryyourco.com
Folders
Placement tests
Know you'll land
Before a campaign goes out, send a test to seed inboxes and see where it lands, provider by provider.
/ 26 seed inboxes checked
Gmailwaiting
Outlookwaiting
Yahoo & otherswaiting
Placement test
InboxSpam
Ramp
Grows a little every day
A brand-new domain sending 40 emails on day one looks like a spammer. The ramp starts small and sends a little more each day, and the app shows why today's limit is what it is.
Warmup ramp · 30 days
Authentication
SPF, DKIM and DMARC, checked daily
Each domain is checked for SPF, DKIM, DMARC and MX, plus blocklists. If something breaks, you get the exact record to add.
SPFchecking…
DKIMchecking…
DMARCchecking…
MXchecking…
Blocklistschecking…
DNS check · 3 domains
Hosted mailboxes
OneMail
Or let us host them
OneMail mailboxes are hosted by Warmerly: we publish the DNS records and start warmup on every one, from $0.99 to $2.99 a month by plan. Ready-warmed Instant mailboxes are also offered when some are in stock. Every signup also gets a free sandbox mailbox that's already warming.
hello@yourco-mail.comOneMail · Hosted
Warmingteam@yourco-mail.comOneMail · Hosted
Warmingsandbox@yourco-mail.comFree sandbox
WarmingMailboxes
Cold email
Then send cold email that lands.
Campaigns run from the mailboxes you've warmed, inside the limits warmup has earned. Sequences, checks before launch, and every reply in one place.
Campaigns
Sequences that read like a person wrote them
Steps and waits in one sequence. Merge tags are checked against every lead before launch, and {{ai_opener}} writes a first line for each one.
Step 1 · EmailDAY 0
Hi {{firstName}}, saw {{companyName}} is hiring two SDRs. When outreach scales that fast, the first thing to break is usually the inbox.↓ Wait 3 days · only if no reply
Step 2 · EmailDAY 3
{{ai_opener}} Worth a 15-minute look next week?↓ Wait 4 days
Step 3 · EmailDAY 7
Quick nudge in case this got buried. Worth a look, or shall I close the loop?Sequence
Sending limits
Volume never outruns reputation
Campaign sends share each mailbox's daily limit with warmup. Mailboxes still warming send less, and the app tells you so before you launch.
sam@outreach-yourco.com28 / 30
jo@tryyourco.com28 / 30
hello@getyourco.com14 / 16
sales@getyourco.com10 / 12
CampaignWarmupHeadroom
Before you launchTwo mailboxes in this campaign are still warming, so they'll send at a lower volume for now.
Campaign · today
Inbox
Every reply, one queue
Everyone who replied and hasn't heard back, from every mailbox, labelled by intent with a suggested answer. Clear it and it tells you you're caught up.
P
Priya · Northlane StudioYes, happy to chat. Thursday afternoon?
InterestedL
Leo · ParkwaySend over pricing and I'll take a look.
InterestedI
Ines · Coastal LabsNot for us right now, thanks.
Not relevantSuggested replyGreat, Thursday at 2pm. I'll send an invite.
All caught upEveryone who replied has heard back.
Replies3 waiting
Prospecting
Who to send to
Find leads in Warmerly's own company database, find their address and verify it before it joins a sequence. Fewer bounces, less damage to the reputation you've built.
priya@northlane.studioverifying…
leo@parkway.coverifying…
info@coastal-labs.ioverifying…
tom.b@brightfield.devverifying…
Leads
Every screen
Desk and pocket.
Web app and phone app designs
In your pocket
Replies don't wait for your desk.
Home, mailboxes, inbox and campaigns, sized for one hand. When someone replies, you see it, read the thread and answer from the queue before the lead goes cold.
Design renders with sample data. The date is a target and the screens may change. See the iPhone app or the Android app.
01Notified
A reply lands on the lock screen with who it is and what they said.
02Read
One queue across every mailbox, sorted into interested, not relevant or spam.
03Answered
A suggested reply to edit and send. The thread stays in the mailbox it came from.
Both lights
Pre-dawn or midday. Same warmth.
Every screen is designed twice, not inverted. Drag across to compare, or use the switch in the top bar: your choice is remembered across the site and the app.
Dark on the left · light on the right · drag to compare#08080A / #FAFAF8 · ember #FF5A1F / #F04A12
Pricing
Flat rate.
No per-inbox fees.
Pick a plan by how many mailboxes you warm. Paid plans send without a meter. Prices in USD.
Free
$0/month
1 mailbox
- Warmup on 1 mailbox
- Capped campaign sends
- Free sandbox mailbox
Starter
$19/month
5 mailboxes
- Unmetered sending
- Warmup and placement tests
- Campaigns and sequences
Growth
$49/month
25 mailboxes
- Unmetered sending
- Everything in Starter
- Five times the mailboxes
Agency
$179/month
100 mailboxes
- Unmetered sending
- Client workspaces
- API access
7-day trialOn paid plans, standard.
30-day inbox guaranteeOn paid warmup plans. Conditions apply.
OneMail mailboxesHosted by Warmerly and warming from day one, $0.99 to $2.99 a month, by plan.
Free sandbox mailboxEvery signup gets one, already warming.
Questions
Straight answers.
How warmup works, what it costs and what it doesn't do.
What does email warmup actually do?
It gives a mailbox a sending history. Warmerly sends a small, growing number of real conversations between your mailbox and a network of others. They're opened, replied to with quoted text, and moved out of spam if they land there. Inbox providers read that history when deciding where your outreach goes.
How long until a mailbox is ready?
The warmup ramp runs 30 days, from 4 messages a day to 50 (Gmail stops at 40 and Outlook at 30), and it grows each day. You can launch sooner: a campaign on a young mailbox starts slowly by itself. The app shows each mailbox's warmth, today's limit and the reason for it, so you can see progress rather than guess.
Do I pay per mailbox?
No. Each plan includes a number of mailboxes (1, 5, 25 or 100) at a flat monthly price, and paid plans have unmetered sending. OneMail hosted mailboxes are the only per-unit extra.
Which mailboxes can I connect?
Google Workspace and Gmail, and Microsoft 365. You can also add OneMail, our own hosted mailboxes, including ready-warmed ones when some are in stock. Every signup gets a free sandbox mailbox that's already warming.
Will warmup emails reach my real contacts?
No. Warmup conversations go between mailboxes in the warmup network, not to your prospects or customers. Your campaigns are separate and only go to the leads you add.
Can I send campaigns from Warmerly too?
Yes. Campaigns and sequences run from your warmed mailboxes, with pre-launch checks and merge-tag checking. Sends share each mailbox's daily limit with warmup, and replies from every mailbox land in one inbox.
Is there a mobile app?
Not yet. We are building apps for iPhone and Android, and we expect to launch them in autumn 2027. That is a target and it may move. The phone screens on this page are design renders with sample data. See the iPhone app and Android app pages. Warmerly is available on the web today.
Warm it up
before you send.
Connect a mailbox today. It starts warming the same day, and you'll see every degree it gains.
Start warming freeSee pricing
- Free plan, no time limit
- 7-day trial on paid plans
- 30-day inbox guarantee, with conditions
- Customer data is hosted in the EU
Free plan: 1 mailbox · Starter from $19 a month
