Maildoso vs Zapmail: cheap SMTP volume against Google and Microsoft mailboxes with warm-up handled

Maildoso lists the lower mailbox price of the two, $0.75 at 300 and $0.49 at 1,000, but its SMTP mailboxes send 15 cold emails a day and you bring warm-up. Zapmail sells Google Workspace and Microsoft 365 mailboxes with warm-up handled. Both run an MCP server; neither sends campaigns.

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  • Warm-up and sending included
  • $2.50 a mailbox, 12 minimum
  • Month-to-month billing

Maildoso

Zapmail

Price per mailbox
from $0.49 on the 1,000 plan; $2.50 on the 30 planfrom $2.50 (Pro, yearly); $2.99 on monthly Pro
Smallest order
30 mailboxes, $75 a month, on the standard plansStarter: 10 mailboxes, $39 a month
Mailbox types
SMTPGoogle, Microsoft
Warm-up
Not provided; 14+ days in an outside tool such as the Instantly pool, kept runningHandled by Zapmail per its FAQ; no separate price or schedule published

Maildoso vs Zapmail, line by line

Each cell links to the vendor's page it comes from.

Maildoso and Zapmail prices

Maildoso

Maildoso plans and prices
PlanPriceMailboxesPer mailboxBillingIncludes
30 mailboxes$75 a month30$2.50monthlyIP rotation, self-healing mailboxes, placement tests, API and MCP; domains extra source (opens the vendor's page in a new tab)
300 mailboxes$225 a month300$0.75monthlySame features; domains extra source (opens the vendor's page in a new tab)
1,000 mailboxes$499 a month1,000$0.49monthlySame features; domains extra source (opens the vendor's page in a new tab)

Zapmail

Zapmail plans and prices
PlanPriceMailboxesPer mailboxBillingIncludes
Starter$39 a month10 (extra $3.50)$3.90monthly3 placement-test and 3 AI Insights credits a month source (opens the vendor's page in a new tab)
Growth$99 a month30 (extra $3.25)$3.30monthly10 test and 10 AI Insights credits a month source (opens the vendor's page in a new tab)
Pro$299 a month100 (extra $3.00)$2.99monthlyAPI access, priority support, 30 test credits a month source (opens the vendor's page in a new tab)
Pre-warmed Starter$39 first month, then $243$8.00monthly1 domain; 12+ weeks of warm-up history source (opens the vendor's page in a new tab)
Pre-warmed Growth$149 first month, then $8412$7.00monthly4 domains source (opens the vendor's page in a new tab)
Pre-warmed Pro$339 first month, then $18030$6.00monthly10 domains source (opens the vendor's page in a new tab)

List prices from Maildoso's pricing page and Zapmail's pricing page, checked . Taxes and card fees excluded.

Cost at 30 and 100 mailboxes

30 mailboxes: Maildoso's entry pack is $75 a month; Zapmail Growth is $99. Maildoso adds a warm-up tool and $15 a domain a year; Zapmail domains are $13 and warm-up is part of the service.

100 mailboxes: Maildoso has no 100 pack, so you buy 300 for $225 or a custom count in the app at an unpublished price. Zapmail Pro is $299 for exactly 100, or $250 a month on yearly billing.

Count sends, too. 100 Maildoso mailboxes send up to 1,500 cold emails a day at the 15 cap. Zapmail publishes no cap for standard mailboxes; if you send 25 a day from each, 100 of them send 2,500.

Where they differ

Mailbox type decides most of it

Maildoso is SMTP on its own servers and IPs, with IP rotation and self-healing. Its Google Workspace product is closed to new mailboxes. Zapmail is Google Workspace and Microsoft 365 only, one domain per workspace, on US or EU IPs.

If your prospects are company addresses and you test placement, SMTP can work well. If your buyers sit on Google or Microsoft and you want the same provider, Maildoso is out of the running.

Warm-up and recipients

Maildoso does no warm-up and requires 14+ days in an outside tool. Its terms also forbid sending to personal webmail such as Gmail addresses.

Zapmail's FAQ says it handles warm-up and it sells pre-warmed mailboxes that send from day one, at $39 for 3 in the first month.

AI agents

Both publish hosted MCP servers. Maildoso's uses the same token as its API. Zapmail's uses OAuth 2.1 and exposes 134 tools, including billing and workspaces.

Refunds

Maildoso offers a 30-day guarantee that pays only when mailboxes fail to send for 3+ days through its fault. Zapmail refunds duplicate billing or a setup not done within 7 business days. Neither refunds because results were poor.

Which one to pick

Pick Maildoso if

  • You run hundreds of SMTP mailboxes and already pay for warm-up and a sequencer
  • You send only to company addresses and already have warm-up and a sequencer
  • 15 cold emails per mailbox a day is enough

Pick Zapmail if

  • You need Google Workspace or Microsoft 365 mailboxes
  • You want warm-up handled, or pre-warmed mailboxes
  • You buy in blocks of 10, 30 or 100

Where Outreach2day fits

We sell cold email mailboxes too, so this section is ours. The comparison above does not rank us.

Outreach2day sits between them. Like Maildoso, our mailboxes are SMTP/IMAP; unlike it, warm-up and a sending engine are in the $2.50, and each mailbox sends up to 25 cold emails a day from 12 mailboxes.

Like Zapmail, we run an MCP server, and setup is a few minutes. We sell no Google or Microsoft mailboxes, so if that is the requirement, Zapmail is the one of us three to pick.

From 1,000 mailboxes Outreach2day quotes a volume price below the per-mailbox list price of every vendor in our comparisons, including Maildoso's $0.49, with warm-up and sending in the price. Book a call and we quote your volume.

Maildoso vs Zapmail: questions

Is Maildoso cheaper than Zapmail?

Per mailbox, yes: $2.50 on the 30 pack and $0.75 or $0.49 on 300 or 1,000, against Zapmail's $3.90 to $2.99 on monthly plans. Add Maildoso's warm-up tool and its 15-a-day cap before comparing totals.

Which has Google Workspace mailboxes?

Zapmail. Maildoso's Google Workspace product is closed to new mailboxes.

Do Maildoso and Zapmail include warm-up?

Zapmail says it handles warm-up. Maildoso does not provide it and requires 14+ days in an outside tool.

Do both have MCP servers?

Yes. Maildoso at mcp.maildoso.com with its API token; Zapmail with OAuth 2.1 and 134 tools.

Can I send to Gmail addresses with Maildoso?

Maildoso's terms forbid sending to personal webmail addresses such as Gmail or Yahoo.

Deliverability call

Talk to our deliverability team

Book a call with the people who run our mailbox infrastructure. We look at your current setup and tell you what to change. Running 1,000+ mailboxes? We also quote a volume price below every vendor list price in our comparisons, warm-up and sending included.

  • Review your domains, DNS records and current inbox placement
  • Size the setup: domains, mailboxes per domain and daily volume per mailbox
  • Plan warm-up and the move from your current provider or sequencer
  • 1,000+ mailboxes: a volume price per mailbox for your setup

Free call

See open times in your time zone and book on this page.

Or open the booking page

More on Maildoso and Zapmail

Sources

Each vendor's own pages. Vendors change prices and plans; if something here is out of date, write to support@outreach2day.com and we will fix it.

First cold emails on day 14, full volume on day 21

Add domains, create mailboxes and turn on warm-up. You see every mailbox's warm-up numbers from day one.

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