Gmail add-on

The EmailBuilder Gmail add-on adds a sidebar to Gmail compose that lists your templates. Click one to insert it as the email body — your existing recipients, subject, and attachments stay intact.

It's best for one-to-one or small-batch sending: sales follow-ups, support replies, hand-curated newsletters under a few hundred recipients. For large campaigns, connect an ESP and use the Send Wizard.

Install

1. Open the EmailBuilder.ai for Gmail listing on Google Workspace Marketplace.
2. Click Install. Grant the requested permissions — the add-on needs read/write access to the compose draft only, not to your inbox.
3. Open Gmail and click Compose. You'll see an EmailBuilder icon in the right-side add-on tray.

Connect to your EmailBuilder account

The first time you open the add-on, it asks for an API key:

1. Sign in to app.emailbuilder.ai.
2. Go to Account → Integrations → API Keys.
3. Click Generate new key, give it a name (e.g. "Gmail add-on"), and copy the key.
4. Paste it into the add-on sidebar and click Connect.

The link is remembered. From then on, opening Gmail in the same Google account skips this step and shows your templates straight away.

Use it

1. Click Compose in Gmail.
2. Click the EmailBuilder icon in the right-side add-on tray.
3. Browse or search your templates. Pick one.
4. Click Insert into draft.

The template's HTML replaces the compose body. From there you can:

• Edit recipients, subject, attachments as usual.
• Tweak text or images using Gmail's compose toolbar (the rendered HTML is editable).
• Click Send when you're done.

A copy of the message is stored in your Sent folder, not on EmailBuilder — Gmail handles delivery, so you also get the recipient's reply in your normal inbox.

Caveats

• No mass send. The add-on inserts into one compose window at a time. For lists, segments, or CSV blasts, use the Send Wizard with a connected ESP.
• No merge tags in compose. Gmail compose doesn't substitute template variables — what you see in the preview is exactly what the recipient gets. If you have personalization, do the substitution in EmailBuilder first, then insert.
• No deliverability authentication via the add-on. Mail goes out on Gmail's infrastructure with whatever DKIM/SPF Google already has for your domain. If you send from a custom domain, make sure SPF and DKIM are configured in Google Workspace.

Disconnecting

To disconnect a Google account from EmailBuilder:

• From the add-on: click the gear icon → Disconnect. The Gmail account is unlinked; templates no longer appear until you reconnect.
• From EmailBuilder: Account → Integrations → API Keys → revoke the key you gave the add-on. The add-on will prompt you to reconnect on next use.

Revoking the API key disconnects every device or integration using that key. Use named keys ("Gmail add-on", "Zapier", "Outlook add-in") so you can revoke selectively.

Outlook?

We have an Outlook add-in in the same shape — install from the Microsoft AppSource listing and follow the same API-key flow. The UI and constraints are identical.