Maildoso Pricing 2026: $75, $225 and $499 Plans, Real Cost

Maildoso sells SMTP mailboxes in monthly packs: 30 mailboxes for $75 ($2.50 each), 300 for $225 ($0.75) and 1,000 for $499 ($0.49). Custom counts are sold in the app from $0.49 a mailbox. Warmup is not included, there is no sequencer, and each mailbox sends up to 15 cold emails a day. Domains are $15 a year. Maildoso has a no-discount policy, so the pack prices are the prices. For other SMTP and Google sellers priced at the same volume, see Maildoso alternatives.

Prices below are from maildoso.ai/pricing, checked November 4, 2026. Its pricing FAQ says the plans are current "as of June 2026".

Maildoso Plans and Prices

The last column is the pack price ÷ (mailboxes × 15 cold emails a day × 22 sending days) × 1,000, before a sequencer and warmup. You buy a license for a mailbox count, so deleting and recreating a mailbox does not cost extra. Over 10,000 mailboxes, terms go through Maildoso's sales team.

The toggle also shows "Quarterly (legacy)" plans with domains included: 32 mailboxes and 8 domains for $299 a quarter (about $99 a month), 68 and 17 for $499 (about $166) and 400 and 100 for $2,199 (about $733). There is no annual billing.

Maildoso does not discount: "No, we have a no-discount policy. Our prices are the same for all users, and we do not run promotions or sales." Its "300 mailboxes for 30 days" trial page is a paid first month at $225, the 300-pack price, shown next to a crossed-out $570; we found no free month.

Where the $0.49 comes from

The headline "Mailboxes from $0.49/mo" is the 1,000-mailbox plan: $499 a month ÷ 1,000. Below 1,000 the rate is $0.75 (300 pack) or $2.50 (30 pack), and custom counts in the app start at $0.49 with exact prices shown only in the app. At 15 cold emails a mailbox a day, the $0.49 rate is $1.48 per 1,000 cold emails before a sequencer and warmup.

Maildoso's pricing page sets its price against Google: a table puts the monthly cost of sending 1,000 emails a day at $165 on Google Workspace ($5 a mailbox, 30 a day), $250 on Azure tenants and $33 on Maildoso ($0.49, 15 a day). Those are its figures, with the 1,000-plan rate; the cost tables below compare everyone at the same emails a day, sequencer and warmup included.

What the Plans Include

• SMTP mailboxes on Maildoso's own servers and IPs, with IP rotation

• Self-healing mailboxes: burned-out mailboxes are taken off campaigns for 14 days to recover, and IPs that stop working are replaced; plus CAPTCHA domain protection

• Inbox placement tests every 3 days and a health score for each mailbox

• API and MCP access on every plan

• Free deliverability audits

• Sync to Instantly, Smartlead and EmailBison, plus CSV export

Not included: warmup and a sequencer. The pricing page is direct about warmup: "For any new mailboxes and domains, you must run a warm-up for at least 14 days before launching your first campaign." Each mailbox can send "up to 15 cold emails / 80 warm-up emails per day". Up to 99 mailboxes fit on a domain; Maildoso recommends no more than 8.

Costs on Top of the Plan

Domains stay registered with Maildoso while you use the service. You can ask for them back, and Maildoso says it will transfer them "at no charge at the end of your subscription."

We found no free trial. The pricing page lists a 30-day money-back guarantee for new users on monthly SMTP packages, and its FAQ adds a refund if deliverability falls below 80%. The terms narrow the refund to one case (read October 20, 2026): "A refund may be issued if the client's mailboxes fail to send emails for 3 or more consecutive days due to a fault on Maildoso's side." Domains are not refunded.

What Maildoso Costs at 2,500 to 25,000 Emails a Day

Same method as our provider comparison: monthly list prices at the same cold emails a day, each vendor at its own limit per mailbox, domains left out. Maildoso caps cold sending at 15 a day, so the same volume needs more Maildoso mailboxes than ours at 25 a day. We price the cheapest mix of its 30, 300 and 1,000 packs that covers the count, and add the cheapest Instantly plan for warmup and sending (checked November 4, 2026).

Instantly plans used: Hypergrowth ($107, 125,000 emails a month) up to 5,000 a day; at 25,000 a day (550,000 a month), Light Speed plus one Outreach add-on, $445. Outreach2day mailboxes are $2.50 up to 99, $1.50 from 100 and $0.50 from 1,000, with warmup and our sequencer in the price. The gap comes from three lines: Maildoso needs 1.7 times as many mailboxes for the same volume, and warmup and a sequencer are billed elsewhere.

If you use a different sequencer or warmup tool, replace the Instantly line with its price. Maildoso vs Instantly compares Maildoso packs with Instantly's own done-for-you Google accounts, line by line.

Maildoso Cost per 1,000 Emails

The full setup ÷ cold emails a month (a day × 22) × 1,000:

What one email costs by provider and mailbox type is in our cold email cost per email report, and the cold email cost calculator prices Maildoso packs in Instantly for any daily volume.

Maildoso vs Outreach2day

With us, one subscription covers what takes Maildoso plus a sequencer and a warmup tool, and each mailbox can send up to 25 cold emails a day instead of 15. Both sell SMTP mailboxes; Maildoso's Google Workspace product is currently unavailable. Our mailboxes run on our own infrastructure and land in the inbox. The side-by-side is at Outreach2day vs Maildoso, and other options are in Maildoso alternatives. Maildoso next to the other providers, scored on full-setup cost: best cold email infrastructure providers.

Before you buy, read the Maildoso review for the refund terms and the recipient rules. Maildoso is compared with other vendors in Maildoso vs Zapmail and Maildoso vs Inframail. Other SMTP sellers are read from their own pages in our Infraboxes review (private SMTP from $2.30 at 1,000+) and Mission Inbox review (dedicated IPs, billed per 1,000 sends). MailDeck vs Maildoso compares its packs with MailDeck's private SMTP at $0.50 an inbox (MailDeck review). Inframail on its own is set against other vendors in Inframail alternatives, and its flat plan and 28-day billing are read in the Inframail review.

FAQ

How much does Maildoso cost per mailbox?

$2.50 on the 30-mailbox plan ($75 a month), $0.75 on the 300 plan ($225) and $0.49 on the 1,000 plan ($499). Warmup and a sequencer are not included, so budget for a sequencer on top.

Does Maildoso have a discount or coupon?

No. Its FAQ states a no-discount policy: the same prices for every user, with no promotions or sales.

Does Maildoso include warmup?

No. Maildoso asks for at least 14 days of warmup before the first campaign, through outside providers or the Instantly warmup pool, and to keep it running for the life of the mailbox.

How many cold emails can a Maildoso mailbox send?

Up to 15 cold emails and 80 warmup emails a day, per the pricing page.

Does Maildoso offer refunds?

New users on monthly SMTP packages have a 30-day money-back guarantee, which the terms limit to mailboxes failing to send for 3 or more days in a row through Maildoso's fault. Domains are never refunded.

Sources

Checked November 4, 2026:

• Maildoso pricing: plans, legacy quarterly plans, domains, warmup, sending cap, discounts, guarantee.

• Instantly pricing: Hypergrowth, Light Speed and the Outreach add-on used in the full setup.

Checked September 28 and October 20, 2026:

• Maildoso home page: setup, sequencer sync.

• Maildoso API: API and MCP.

• Maildoso terms of service: refund conditions.