Instantly AirMail vs Zapmail
Instantly AirMail (AirMail SMTP inboxes on Instantly infrastructure) and Zapmail (Google & Microsoft mailboxes) are both popular cold email infrastructure picks. For 30 mailboxes on 10 domains, Zapmail is cheaper at $107.72/mo vs $128.72/mo for Instantly AirMail, a difference of $21 a month ($252 a year).
Last updated 2026-11-02 · list prices, monthly billing
Instantly AirMail
Verdict by use case
Side by side
| Instantly AirMail | Zapmail | |
|---|---|---|
| Mailbox type | Shared SMTP | Google/Microsoft reseller |
| Platform | SMTP | GoogleMicrosoft |
| Per mailbox / month | $4.00 Listed as $4 per inbox, no minimum; Instantly's page does not state the billing period. Runs on Instantly's own infrastructure, not Google or Microsoft. | $3.30 Plan prices ($39/10, $99/30, $299/100) from a third-party table (outboxes.io/compare); Zapmail's own page lists additional mailboxes at $3.50 / $3.25 / $3.00 by plan but plan totals did not render. |
| 30 mailboxes / month | $120 | $99 |
| + 10 domains / month | $8.72 * | $8.72 * |
| Total / month | $128.72 | $107.72 |
| Minimum | None | 10 mailboxes (starter plan, third-party) |
| Warmup | Not stated | Optional |
| Sending cap | None published | None published |
| Price source | Provider page | Third-party table |
* Reference .com price used (provider domain price not published).
Frequently asked questions
Is Instantly AirMail cheaper than Zapmail?
For 30 mailboxes + 10 domains on monthly list prices, Zapmail is cheaper: $107.72/mo vs $128.72/mo (checked 2026-11-02).
What's the difference between Instantly AirMail and Zapmail?
Instantly AirMail: AirMail SMTP inboxes on Instantly infrastructure, $4.00 per mailbox, minimum none, warmup not stated. Zapmail: Google & Microsoft mailboxes, $3.30 per mailbox, minimum 10 mailboxes (starter plan, third-party), warmup optional.
Which is better for cold email, Instantly AirMail or Zapmail?
On price, Zapmail wins for a 30-inbox setup. Beyond price, compare platform (SMTP vs Google/Microsoft), minimums and warmup. MailboxWatch doesn't test deliverability.