Maildoso
High volume SMTP and Google mailbox provisioning at the low end of the price range.
From $75/mo MCP server API
Bottom line
SMTP mailboxes for cold email, from $75/mo for 30 inboxes. API and MCP on every plan. 30-day money-back.
Stands out for: MCP at mcp.maildoso.com plus REST so assistants can register domains and create mailboxes.
Watch out for: Monthly plans skip domains ($12/year each). Cap is 1,000 mailboxes. A 30-day money-back window is not a trial.
Overview
Maildoso sells SMTP mailboxes for outbound, with rotating IPs, self-healing accounts, and CAPTCHA domain protection. Monthly packs are 30 mailboxes for $75 ($2.50 each), 300 for $225 ($0.75 each), and 1,000 for $499 ($0.49 each). Every plan includes API and MCP access, free deliverability audits, and a 30-day money-back guarantee. Each mailbox can send up to 15 cold emails and 80 warmup emails per day. Quarterly SMTP packs still exist as legacy.
Teams pick Maildoso to scale SMTP without Google Workspace fees. The REST API and MCP server at mcp.maildoso.com register domains, create mailboxes, set SPF, DKIM, and DMARC, and export to sequencers. Monthly plans need domains bought separately at $12 per year, rising to $15 on October 1, 2026. The 30-day money-back window is a refund policy, not a trial. Native export names Instantly and Smartlead among others.
Who it's for
Best for
- Agencies that want cheap SMTP at volume
- Teams automating inbox setup through MCP
- Senders who will buy or connect their own domains
- Shops that need self-healing rotating IPs
Not ideal for
- Buyers who need Google or Microsoft inboxes in the $75 pack
- Senders who want a free trial rather than money-back
Key features
SMTP relay. SMTP mailbox and relay infrastructure for high-volume outbound email.
Google Workspace. Official Google Workspace mailbox provisioning for outbound sending.
Shared IPs. .
Pre-warmup. Pre-warmed inboxes on most plans.
Billing. Quarterly or annual billing, no free trial.
MCP server
First-party MCP confirmed on the vendor site: https://maildoso.ai/resources/api
Setup steps and live status MCP Directory Check your stack in the MCP readiness checker
Pricing
| Plan | Price | What you get |
|---|---|---|
| 30 mailboxes | $75/mo | $2.50 per mailbox |
| 300 mailboxes | $225/mo | $0.75 per mailbox |
| 1,000 mailboxes | $499/mo | $0.49 per mailbox |
| Domains | $12/year | $15 from 1 Oct 2026, on monthly plans |
Monthly SMTP packs: 30 mailboxes $75/month ($2.50 each), 300 mailboxes $225/month ($0.75), 1,000 mailboxes $499/month ($0.49). API and MCP included. Domains $12/year on monthly plans ($15 from 1 Oct 2026). 15 cold emails per mailbox per day. 30-day money-back is not a trial. Legacy quarterly packs still listed. Confirm current terms on the vendor site.
Checked 19 Sep 2026. Vendors change prices without notice.
Is Maildoso expensive?
Maildoso starts at $75/mo. We list 36 deliverability tools in total. 4 have a free tier, and those with a public price typically start around $10 a month.
- 1 quote-based
- 4 free tier
- 35 public price
Worked out automatically from every deliverability listing, so it updates as the directory changes.
Pros and cons
Pros
- $75/mo for 30 SMTP mailboxes
- MCP and REST API on every plan
- 30-day money-back guarantee
Cons
- Domains extra on monthly plans
- 15 cold emails per mailbox per day
- No free trial, only money-back
Integrations
Instantly Smartlead
What's new at Maildoso
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How Maildoso compares
See all Maildoso alternatives, with what each one does differently and a head to head for every pairing.
| Tool | Free tier | From | MCP | API | Compare |
|---|---|---|---|---|---|
| | – | $75/mo | ✓ | ✓ | |
| | – | $3/mailbox/mo | – | – | Compare |
| | – | $39/mo | – | ✓ | Compare |
| | – | $4/mailbox/mo | – | ✓ | Compare |
| | – | $3/inbox/mo | – | ✓ | Compare |
$3/mailbox/mo
Shared-IP mailboxes from $3 with automated DNS and a 10-slot minimum.
$39/mo API
Real Google and Microsoft mailboxes from $39/mo.
$4/mailbox/mo API
Private dedicated infrastructure from $4 per mailbox slot.
$3/inbox/mo API
SMTP inboxes from $3 each with Google and Microsoft options.
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