YAMM Review

YAMM — short for Yet Another Mail Merge — is one of the oldest and most widely installed mail merge add-ons in the Google ecosystem. It takes a spreadsheet of recipients and a Gmail draft, then sends each row its own personalized copy from your own mailbox. This review covers what it verifiably does, what its published limits are, where the pricing gets opaque, and why it is a poor fit for cold outreach specifically.

Verdict at a glance

What YAMM actually does

YAMM is deliberately narrow. Recipient data lives in Google Sheets, one row per person, with columns doubling as merge fields. The message body is either a normal Gmail draft containing merge tags or one of YAMM's built-in layouts. Hit send, and YAMM loops the list, substituting each row's values and dispatching individual messages through your Gmail account.

That last detail is the whole product thesis. Because delivery happens through your real mailbox rather than a third-party sending service, each message arrives as an ordinary one-to-one email with your normal sender reputation behind it. There is no separate SMTP relay, no bulk-mail header signature, and no separate domain to warm up. The trade-off is that everything you send is charged against your own Google sending quota and your own domain's reputation.

How it works in practice

The workflow is short enough to describe completely: install the add-on, prepare a sheet, compose a draft with merge tags, run a preview, send a test to yourself, then launch. YAMM writes a status column back into the spreadsheet and updates it as recipients open, click, reply, bounce, or unsubscribe. Scheduling lets you queue a campaign for a later time, and attachments can be fixed for everyone or pulled per row for things like individualized certificates or invoices.

For the use cases it was built for — a school emailing parents, a nonprofit thanking donors, a recruiter updating candidates — that is genuinely all you need, and the absence of a campaign dashboard is a feature rather than a gap.

YAMM pricing (2026)

The free tier is real and permanent: 20 recipients per day, one user, and no branded footer added to your messages. Tracking and scheduling are included even at zero dollars, which is unusually generous for a free plan.

Paid tiers are structured around daily send caps rather than feature gates:

The cost math deserves a warning. YAMM's public pricing page lists the limits above but not the dollar figures — it states only that prices vary by billing country and exclude taxes, with actual rates surfaced when you subscribe. We could not verify current USD prices from any source we trust, so we are not quoting numbers here. Assume you will see your price only at checkout, and check it against your own currency.

Two structural cost points hold regardless of the sticker price. First, licensing is per seat, so a team of five is five subscriptions, not one shared account — the Team and Unlimited tiers exist precisely to make that less painful, with custom pricing above 100 users and discounts for education and nonprofit buyers at 25 seats or more. Second, the daily cap is not the only ceiling: Google's own account-level sending limits apply on top, and the 1,500-per-day Workspace figure only makes sense on a Workspace account in the first place.

What we could and couldn't verify

We fetched YAMM's own site for the feature set and the plan limits above, and those are current as published. Beyond that, the independent evidence is thinner than the product's scale suggests.

The one substantial third-party signal is the Google Workspace Marketplace listing, which shows a 4.8 out of 5 average across roughly 18,200 ratings and claims more than 16 million users. That is an enormous rating base by the standards of this category, and it is a fair indicator that the core mail merge works reliably for ordinary use. But marketplace star ratings are shallow evidence: they skew heavily toward first-week impressions, and they do not tell you how the tool holds up over a year of use.

What we could not obtain was substantive review prose. G2's review pages blocked our requests, and a Capterra listing we checked returned an unrelated product, so we discarded it rather than report figures we could not attribute. We found no credible independent deliverability testing of YAMM, and no aggregated complaint themes we would stand behind. If you see a review page confidently listing YAMM's weaknesses from hands-on testing, treat it skeptically unless it names its methodology.

Pros and cons

Pros

• Free tier is genuinely usable and includes tracking, scheduling, and no forced branding
• Zero infrastructure: no domains, no warmup, no SMTP setup
• Results write back into the spreadsheet, which keeps reporting where your data already lives
• Very large and very positive marketplace rating base
• Dynamic per-row attachments handle a real use case most sequencers ignore

Cons

• Public prices are not published in dollars, which makes budgeting awkward before checkout
• Per-seat licensing scales poorly for small teams below the Team tier
• No sequences, no automated follow-ups, no reply detection routing — it is a single-send tool
• Sends from your primary mailbox, putting your main domain's reputation directly at risk on any cold list
• Locked to Google; nothing here works for Microsoft 365 users

YAMM alternatives

• Mailmeteor — the closest direct rival, also a Sheets-based Gmail mail merge, with a similar free tier and a comparable simplicity-first design.
• GMass — heavier Gmail-native sending with follow-up sequences and list management, aimed at people who outgrew basic mail merge.
• Streak — a CRM built into Gmail that includes mail merge as one feature among pipelines and tracking.
• Mixmax — sales engagement inside Gmail: sequences, scheduling, and templates, priced well above add-on territory.
• Saleshandy — a full outbound sequencer with multi-inbox rotation, for teams doing actual cold campaigns rather than announcements.
• Slicey — managed, done-for-you Google and Microsoft inboxes (Microsoft from $0.49 per inbox) with a self-serve dashboard, delivered pre-warmed with deliverability monitoring and automatic domain swaps. Slicey customers also get Outfalcon, a free bundled sequencer with unlimited sending.

Who should use YAMM — and who shouldn't

Good fit: anyone already living in Google Workspace who needs to send a personalized message to a list that expects to hear from them — schools, nonprofits, event organizers, internal comms, recruiters updating candidates, small businesses emailing existing customers. If your list is opted-in and your volume is modest, the free tier may cover you indefinitely.

Poor fit: cold outreach. YAMM has no inbox rotation, no warmup, no dedicated sending domains, and no follow-up sequencing, and it fires everything from the mailbox you rely on for real correspondence. Burning your primary domain on a cold list is the most expensive mistake in outbound, and a mail merge add-on gives you no protection against it. Teams running cold campaigns need separate sending infrastructure plus a sequencer — a different category of tool entirely. Microsoft 365 shops should also look elsewhere, since YAMM is Google-only by design.