Innmail vs YAMM
Innmail vs YAMM is mostly about what happens after the first email. YAMM, short for Yet Another Mail Merge, sends a one-off merge from a Google Sheet. Innmail sends personal outreach from your own mailbox and can follow up as many as four times in the same thread, stopping when someone replies.
Start free with your own mailboxWhat YAMM does well
YAMM is simple. It is a Google Sheets add-on: you pick a draft, pick a sheet, and it sends a merge from your Gmail or Google Workspace account. It has a free tier and per-user plans. For a single mailing to a known list, that simplicity is the whole point.
Follow-ups without chasing a spreadsheet
YAMM has no built-in multi-step sequence. To follow up, you run another merge and work out by hand who already replied. Innmail handles that for you. A campaign can have up to five steps, the first email plus four follow-ups, each landing in the same thread.
Replies and bounces are detected from your own mailbox over IMAP, and follow-ups stop automatically for anyone who answers. No one gets a "just checking in" after they already wrote back.
Moving a YAMM sheet into Innmail
Export the sheet as a CSV and upload it, or paste the rows. Columns become variables like {{firstName}} and {{company}}, and AI can write a per-contact variable, for example a first line that references something specific about each person.
Open "Preview each email" to read every message as it will arrive. Then approve first emails in the review queue. Innmail sends them one at a time inside your sending window, with a randomized delay between each.
When YAMM is the better choice
For a newsletter-style merge, an event invite, or a team update that goes out once and needs no follow-ups, YAMM is quicker. It is also the better fit if you want the work to start and end in Google Sheets, or you want the whole list sent promptly rather than paced across the day.
Innmail and YAMM at a glance
| Innmail | YAMM | |
|---|---|---|
| Sends from | Your one real Gmail or SMTP/IMAP mailbox | Your Gmail or Google Workspace account |
| Where you use it | Web app and Chrome side panel | Google Sheets add-on |
| Follow-ups | Up to four, in the same thread, stop on reply | No built-in multi-step sequence |
| Built for | Personal one-to-one outreach you approve email by email | One-off mail merges from a sheet |
| Pricing model | Free daily credits; optional credit packs or monthly credits | Free tier plus per-user plans |
Based on each product's public description as of 2026. Check YAMM's site for current details.
Frequently asked questions
What is the main difference between Innmail and YAMM?
Follow-ups and review. YAMM sends a one-off merge from a sheet; Innmail sends a reviewed first email plus up to four threaded follow-ups that stop when the person replies.
Can Innmail import my Google Sheet?
Yes, by CSV. Export the sheet, upload the file or paste the rows, and every column becomes a variable you can use in the email.
How does Innmail know someone replied?
It reads replies and bounces from your connected mailbox over IMAP. When a reply arrives, the remaining follow-ups for that person stop.
Is there a free option like YAMM's free tier?
Yes. Innmail includes 500 free credits every day, and one credit is one send your provider accepts.
Does Innmail send the whole list at once?
No. It sends one email at a time with a randomized delay, inside a daily cap and a sending window you set.
Personal outreach, one email at a time.
Connect your Gmail or any SMTP mailbox, approve each email, and let follow-ups stop the moment someone replies. 500 free credits every day.
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