Don't let your mail merge land in spam.
Using Google Workspace for your business email? Warmuply warms up your inbox in the background, so your mail merge lands in their inbox, not spam.
Built for people using YAMM, Gmail mail merge, GMass or Google Sheets scripts.
No credit card. Connect in a minute.
The problem
Google Workspace lets you send 2,000 emails a day. It doesn't tell you that a new inbox gets flagged long before that.
You write a good email. You load your spreadsheet. You hit send.
Then the replies don't come, because most of your emails went to spam.
It's not your email. It's your inbox and your domain. Gmail and Outlook don't trust an address that suddenly sends hundreds of emails with no history behind it. And once your domain gets a bad reputation, it's slow to fix — and it affects every email your business sends, not just the mail merge.
How it works
1. Connect your Workspace inbox
Sign in with Google. It takes about a minute. Nothing changes in how you send.
2. We warm it up
Warmuply sends and receives everyday-looking emails from your inbox, gradually more each day. Gmail and Outlook see a normal, active sender and start to trust your address and your domain.
3. Send when you're ready
Each day, Warmuply tells you how many emails you can safely send. Use that number in YAMM, Gmail mail merge or whatever you already use.
Safe to send today
150
Features
Your safe-send number, every day
No guessing. Open Warmuply and see exactly how many emails your inbox can handle today. The number goes up as your inbox warms.
Domain setup checks in plain English
We check the settings on your domain that decide whether you land in spam — SPF, DKIM and DMARC — and tell you what's wrong in normal words, with the exact text to paste into your domain settings.
Check your domain freeSee where your emails land
Run a placement test and see whether your email reaches the inbox, the Promotions tab or spam at Gmail, Outlook and Yahoo. If something's wrong, we tell you the likely reason.
Blacklist alerts
If your domain lands on a spam blacklist, you'll know the same day, with steps to get off it.
Keeps running in the background
Warmup works best when it never stops. Leave it on and forget about it.
Who it's for
For businesses sending mail merges from their Google Workspace email account.
- Founders, small business owners and small teams emailing customers or partners
- Recruiters reaching out to candidates
- Creators and site owners doing outreach
- Anyone sending a mail merge from a spreadsheet
If you use a cold email platform like Instantly or Smartlead, you probably have warmup built in already. Warmuply is for everyone else.
Works best for
People planning to do a mail merge from a Google Workspace email address.
Pricing
No credit card required.
Every plan includes
- Daily warmup
- Your daily safe-send number
- Domain setup checks in plain English
- Unlimited placement tests per month
- Blacklist alerts
- Cancel anytime
FAQ
It's how you build trust with Gmail and Outlook before sending in bulk. Warmuply gradually sends and receives normal-looking emails from your inbox, so providers see an active, trusted sender instead of a new address suddenly sending hundreds of emails.
You'll see improvement within the first week. Most inboxes need around 4–12 weeks before sending at full volume. Your safe-send number shows you where you are each day.
Yes. Just stay at or below your safe-send number for the day.
No. They're exchanged with our network of inboxes, not your contacts, and they're filed away so they don't clutter your inbox.
No. Keep using YAMM, Gmail mail merge or whatever you use now. Warmuply runs alongside it.
Any email address on your own domain that runs on Google Workspace. Microsoft 365 and other providers aren't supported yet.
It depends on who you're emailing. If your recipients already know you (customers, past clients, people who signed up), use your main business email. Warming it up is safe and helps your messages land in the inbox. If you're sending cold emails to people who've never heard of you, use a separate domain (like getyourbrand.com). Then any spam complaints won't affect the email address you rely on for everything else.
We recommend leaving it on. Inboxes that suddenly go quiet and then send in bulk again can lose the trust they built.
Yes. Connect your inbox and we'll check your domain setup first. Most problems come from missing settings or sending too much too fast, and both are fixable.
Guides for your next mail merge
See all guides- Mail Merge Going to Spam? How to Fix It TodayA mail merge going to spam usually has one of five causes: missing SPF, DKIM or DMARC records, sending far more than your inbox normally…Read the guide
- How to Warm Up a New Google Workspace Email (Step by Step)Here’s how to warm up a new Google Workspace email: set up SPF, DKIM and DMARC on your domain, wait for them to start working…Read the guide
- Gmail Mail Merge Limit 2026: Workspace, YAMM and GMassThe Gmail mail merge limit on Google Workspace is 1,500 recipients a day, inside a total sending limit of 2,000 messages a day. Trial accounts…Read the guide
Your next mail merge deserves to be read.
Connect your Google Workspace inbox in a minute. Warmup starts straight away.
No credit card. Cancel anytime.