How to Send a Mail Merge in Gmail (Step-by-Step)

A mail merge lets you send one email to hundreds of people while making each message read like you wrote it just for them. Instead of a generic blast, every recipient gets their own name, company, and details merged in automatically.

With SendHustle you do this without leaving Gmail — no new sending domain, no separate app to learn. Here's how to send your first mail merge in about five minutes.

Step 1: Connect your Gmail

Install the SendHustle extension and sign in with Google. You send from your real Gmail or Google Workspace account, so replies land in your normal inbox and your sending reputation stays yours. The free tier needs no credit card.

Step 2: Choose your recipients

Open a compose window and pick where your list comes from:

• Google Sheet — the most common choice. Each row is a recipient and each column becomes a merge tag.
• Saved list — a list you've reused before.
• Gmail search — target people you've already emailed using any Gmail search query.
• Manual paste — drop in addresses for a quick one-off.

Before anything sends, SendHustle can verify the list and drop dead addresses so bounces never leave the queue.

Step 3: Write with merge tags

Write your email once and insert merge tags that match your columns — for example {FirstName} or {Company}. Missing a value? Wrap it in a fallback so no one ever sees a blank: {{fallback(FirstName, "there")}}. You can even vary phrasing per recipient with spintax like {Hi|Hey|Hello}.

Step 4: Pace and schedule

Blasting 300 emails in one second is the fastest way to the spam folder. SendHustle paces sends with a delay between each one, and you can set a send window (say, 9am–5pm), skip weekends and holidays, and stay under a daily cap. Schedule it for later or send right away.

Step 5: Track and follow up

Once it's out, you'll see opens, clicks, and replies attributed to each recipient. Add follow-up stages that send only to people who haven't replied — and stop automatically the moment someone does.

That's it

One email, hundreds of personalized sends, all from the Gmail you already use. Start with a small test batch to yourself, confirm the merge tags fill in correctly, then send to the full list.