Mailroom / vs YAMM
Mailroom vs YAMM:
the free, open-source alternative.
YAMM (Yet Another Mail Merge) is a Google Sheets add-on that turns a spreadsheet of contacts into a mail-merge campaign. It's tightly integrated with Sheets — your list lives in a tab, your merge fields are column headers, and YAMM dispatches the send. Mailroom is a standalone web app: same Gmail-based sending, but with a CSV upload instead of a Sheet, and a free tier of 500/day instead of YAMM's free 75/day.
TL;DR
Pick Mailroom if
- 500/day free tier vs YAMM's 75/day
- Open source (MIT), self-hostable
- No Google Sheets dependency — bring any CSV
- Scheduling included free (YAMM gates it behind paid plans)
- Auto bounce detection (YAMM is manual unless you upgrade)
Pick YAMM if
- Live two-way sync with your Google Sheet
- Update tracking columns (sent, opened, clicked) directly in the Sheet
- Google Workspace Add-on store distribution — easier discovery
Feature-by-feature comparison
YAMM is Yet Another Mail Merge, the Google Sheets-native mail merge tool, priced at $24–$60/yr (sometimes /month) per user, with a free tier of 75 emails/day, Google Sheets-only. YAMM runs as Google Workspace Add-on that runs inside Google Sheets.
| Mailroom | YAMM | |
|---|---|---|
| Pricing | $0 | $24–$60/yr |
| Free tier | 500/day forever | 75/day |
| Schedule sends | Yes (free) | Paid only |
| Open tracking | Yes (free) | Paid only |
| Bounce detection | Auto (free) | Manual / paid |
| Mail merge tags | Yes | Yes |
| Sends from your Gmail | Yes (via API) | Yes (via Add-on) |
| Google Sheets integration | No (CSV upload) | Yes (native) |
| Standalone web app | Yes | No (Sheets-only) |
| Open source | Yes (MIT) | No |
| Self-host | Yes | No |
| Templates | Yes | Yes |
| Unsubscribe footer | Yes (HMAC-signed) | Yes |
FAQ: switching from YAMM
I love working in Google Sheets — should I just use YAMM?
If your contacts live in a Sheet and you want sent/opened/clicked status to write back to the same Sheet, YAMM's workflow is hard to beat. If you're fine exporting to CSV (or generating one from a Sheet via File → Download → CSV), Mailroom gives you 6× the free quota and adds scheduling for free.
Can Mailroom read directly from a Google Sheet?
Not yet — Mailroom accepts CSV uploads. Google Sheets exports to CSV in two clicks (File → Download → Comma-separated values), so the workflow is nearly identical. Direct Sheets integration is on the roadmap.
Why does YAMM cap free users at 75/day when Gmail allows 500?
YAMM's free tier is a marketing funnel toward their paid plans, not a technical limit. Mailroom's 500/day free tier matches Gmail's actual API cap because there's no upsell to gate.
Save the $24 and just send the email.
Connect Gmail, upload your CSV, hit send. Free forever.
Start with Mailroom