Email Warmup for YAMM: How It Fits Your Mail Merge

YAMM makes it easy to send one personalized email to every row of a Google Sheet. What it doesn't do is get your inbox ready for that kind of volume. Email warmup for YAMM fills that gap: it builds trust in your Google Workspace inbox so your mail merge has a better chance of reaching people's inboxes.

This page explains why a YAMM send needs a warm inbox, how Warmuply works alongside YAMM without changing how you send, and how to send a safe batch each day.

Does YAMM have email warmup built in?

No. YAMM's features cover writing, sending and tracking your mail merge: personalization, scheduling, unsubscribe links, and open, click and bounce tracking. Warmup isn't on the list.

YAMM does tell you to warm up your account yourself. Its spam guide suggests starting with a small list of fewer than 50 emails and watching how people respond. Its pricing page advises very recent accounts to start at no more than 100 emails a day.

That matters because YAMM sends straight from your own Gmail inbox. Gmail and Outlook judge each email partly on sender reputation: a trust score for your inbox and domain (the part of your address after the @), built from your sending history and how people respond. A new or quiet inbox hasn't earned much yet.

Why your YAMM quota isn't a safe send size

Your YAMM quota is the most YAMM will send in 24 hours. It isn't what your inbox can safely send today.

Google's sender guidelines say to raise volume slowly and avoid sudden spikes, for example suddenly doubling what you sent before. An inbox that has never sent in bulk and then sends 400 emails in an afternoon is exactly that kind of spike.

Our guide to the YAMM daily limit explains each quota and why new Workspace accounts are held at 400.

How email warmup for YAMM works with Warmuply

Warmuply warms up your inbox in the background, and you keep sending with YAMM exactly as you do now.

SPF, DKIM and DMARC are three settings in your domain's DNS (the settings that point your domain to the right services). Together they prove your email really comes from you. Our free domain checker checks all three.

How to send each day's batch in YAMM

Use the safe-send number as the size of each day's YAMM send. YAMM skips rows that are hidden or filtered out, and rows it has already sent to, so a long list is easy to spread over several days.

1. Check today's number. Open Warmuply and note your safe-send number, say 80.
2. Show only today's batch. In your contact list, filter or hide every row after the next 80 unsent rows.

3. Start the mail merge. Go to Extensions > Yet Another Mail Merge: Mail Merge for Gmail > Start Mail Merge. Check the count on the Send emails button matches today's batch before you confirm.
4. Repeat tomorrow. Unhide the next batch. YAMM skips rows already marked EMAIL_SENT, so nobody gets your email twice.

One thing to watch: on Pro, YAMM can automatically send leftover rows when your quota resets. That's handy once your inbox is warm. On a new inbox, it can send a full quota's worth the next day, well above your safe-send number, so filter each batch yourself instead.

If you'd like to see a rough plan in advance, our warmup schedule tool gives an estimated day-by-day ramp.

What warmup can't fix

Warmup builds trust in your inbox. It can't make people want an email they didn't expect.

• Who you email. People who don't know you are the biggest risk. Old, bought or scraped lists also bring bounces.
• Spam complaints. Each "Report spam" click hurts your reputation quickly. Google says to keep the spam rate in Postmaster Tools (its free dashboard for senders) below 0.10% and never reach 0.30%.
• What the email says. Write it like a one-to-one email, keep to one or two links, and skip attachments where you can.

YAMM's unsubscribe link helps here, because people who can opt out easily are less likely to click "Report spam". Keep tracking turned on in YAMM, since its unsubscribe link needs it, and stop emailing anyone who asks.

If your YAMM emails are already landing in spam, start with our 10-minute YAMM spam checklist.

Our guide to spam trigger words covers what in an email's wording really matters.

Still choosing a mail merge tool? See our comparison of Gmail mail merge, YAMM and GMass.

Before you hit send

Before you hit send

• Check your list. Only include people who expect to hear from you, and remove anyone who has asked not to be emailed.
• Check your domain. Run SPF, DKIM and DMARC through our free domain checker.
• Check your batch size. Send today's safe-send number in YAMM and hide the rest of your list until tomorrow.

Warmuply warms up your Google Workspace inbox in the background and gives you that number every day. Start a free 7-day trial.