Coldrig vs Maildoso: mailboxes only vs. the whole job
Maildoso sells SMTP mailboxes for outbound email, priced per mailbox. It does not send campaigns itself: its pages refer to "your sequencer", the tool you connect the mailboxes to. With Coldrig, your assistant buys and sets up the domains and Google mailboxes, warms them, and sends, all in one price. Because the two sell different things, this page makes no price ranking.
Does Maildoso do the same job?
The job is mailboxes, domains, warmup and sending, run by an assistant with nothing done by hand. Maildoso covers the mailboxes, and domains for an extra fee.
| Part of the job | Maildoso | Coldrig |
|---|---|---|
| Mailboxes | Yes. SMTP mailboxes on its own infrastructure, with "API and MCP access" on every plan. Its pages say you can run the whole setup from an AI assistant, then export the mailboxes to your sequencer. | Yes. Google mailboxes, bought and set up by your assistant. |
| Domains | Not on monthly plans: buy them separately ($15 a year from October 1, 2026, per its pricing page) or connect your own. Included on its quarterly plans. | Included in the price, 3 to 5 mailboxes per domain (3 by default). |
| Warmup | Its FAQ says new mailboxes need a warm-up period, and allows up to 80 warm-up emails a day per mailbox. Whether Maildoso runs that warm-up is not stated on the pricing page. | Yes, built in, a ramp of about four weeks per mailbox, up to 40 emails a day once fully warmed. |
| Sending and campaigns | No. Up to 15 cold emails a day per mailbox, sent from the sequencing tool you connect. | Yes, through launch_campaign. |
| Money-back guarantee | 30 days, on every plan. | No refunds on the unused part of a paid period (see Terms); month to month, cancel any time. |
Prices, side by side
| Maildoso monthly plan (read 2026-10-14) | Price | Per mailbox | Daily cap per mailbox |
|---|---|---|---|
| 30 mailboxes | $75 a month | $2.50 | 15 emails |
| 300 mailboxes | $225 a month | $0.75 | 15 emails |
| 1,000 mailboxes | $499 a month | $0.50 | 15 emails |
Maildoso's quarterly plans include domains: 32 mailboxes and 8 domains for $299 a quarter (about $100 a month), and 68 mailboxes and 17 domains for $499 a quarter (about $166 a month). Domains on the monthly plans cost extra, and a sequencing tool is a separate purchase.
Coldrig: $49 a month for 3 mailboxes, $59 for 5, $84 for 10, $134 for 20 and $334 for 60. That one price covers the mailboxes, their domains, warmup and sending, with $0 per-send fees. Sends are not the billing meter on Coldrig, and a mailbox's capacity depends on its warmup stage and health (what counts as a mailbox).
Bottom line
Choose Maildoso when you want mailboxes in bulk to connect to a sequencing tool you already run. Choose Coldrig when you want your assistant to run the whole job, including the domains and the sending.
Related
- Coldrig compared: real monthly cost at 3 to 60 mailboxes.
- Coldrig vs AgentMail.
- Coldrig vs Skyp.
- Coldrig vs FoxReach.
- Coldrig vs Smartlead.