Maildoso vs Instantly AirMail
Maildoso (SMTP mailboxes) and Instantly AirMail (AirMail SMTP inboxes on Instantly infrastructure) are both shared SMTP options. For 30 mailboxes on 10 domains, Maildoso is cheaper at $87.50/mo vs $128.72/mo for Instantly AirMail, a difference of $41.22 a month ($494.64 a year).
Last updated 2026-11-02 · list prices, monthly billing
Instantly AirMail
Verdict by use case
Side by side
| Maildoso | Instantly AirMail | |
|---|---|---|
| Mailbox type | Shared SMTP | Shared SMTP |
| Platform | SMTP | SMTP |
| Per mailbox / month | $2.50 $75/month for 30; $225 for 300 ($0.75); $499 for 1,000 ($0.49). Cap: 15 cold emails/mailbox/day. | $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. |
| 30 mailboxes / month | $75 | $120 |
| + 10 domains / month | $12.50 | $8.72 * |
| Total / month | $87.50 | $128.72 |
| Minimum | 30 mailboxes | None |
| Warmup | No | Not stated |
| Sending cap | 15 cold emails per mailbox per day | None published |
| Price source | Provider page | Provider page |
* Reference .com price used (provider domain price not published).
Frequently asked questions
Is Maildoso cheaper than Instantly AirMail?
For 30 mailboxes + 10 domains on monthly list prices, Maildoso is cheaper: $87.50/mo vs $128.72/mo (checked 2026-11-02).
What's the difference between Maildoso and Instantly AirMail?
Maildoso: SMTP mailboxes (15 sends/day cap), $2.50 per mailbox, minimum 30 mailboxes, warmup no. Instantly AirMail: AirMail SMTP inboxes on Instantly infrastructure, $4.00 per mailbox, minimum none, warmup not stated.
Which is better for cold email, Maildoso or Instantly AirMail?
On price, Maildoso wins for a 30-inbox setup. Beyond price, compare platform (SMTP vs SMTP), minimums and warmup. MailboxWatch doesn't test deliverability.