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Maildoso vs Zapmail: Which Should You Choose?
A look at how Maildoso and Zapmail stack up on price, mailbox type, AI tooling, and scale, so you can figure out which fits the cold email setup you're building.
The Verdict
Maildoso wins on price and a proven scale record — SMTP mailboxes starting at $1.90/mo with 400,000+ mailboxes under management is genuinely hard to beat. Zapmail counters with mailbox quality, leaning on Google Workspace and AI-driven setup tooling. Pick Maildoso for volume and cost efficiency, Zapmail for Google Workspace-grade deliverability.
Either way, both connect into Sendbox.
Maildoso vs Zapmail
| Feature |  Maildoso |  Zapmail |
|---|---|---|
| Pricing | ||
| Price per Mailbox | $1.90-$2.50/mo SMTP starts at $1.90, with the Combo (SMTP plus Google Workspace) option running $2-$3. | $3.00-$3.90/mo Google Workspace mailboxes, priced through tiers plus a base fee. |
| Domain Cost | From $2/domain Domains start at $2 each. | Not specified Domain pricing isn't broken out separately. |
| Cost for 50 Mailboxes | $95-$125/mo 50 mailboxes at $1.90-$2.50 each. | $164-$199/mo Growth's $99 base plus 20 extra mailboxes at $3.25 each. |
| Infrastructure | ||
| Mailbox Type | SMTP + Combo Plain SMTP, or the Combo option that adds Google Workspace. | Google Workspace Google Workspace only. |
| Deliverability | ||
| Pre-warmed Accounts | No Warmup has to come from your sending tool. | Yes Accounts arrive already warmed up. |
| AI Tools | ||
| AI Domain Generator | No Domains are picked manually. | Yes AI proposes domain names built to dodge spam triggers. |
| Scale | ||
| Scale Track Record | 400K+ mailboxes Manages 400,000+ mailboxes and processes 10M+ emails daily. | 1M+ mailboxes Has set up 1M+ mailboxes across 330K+ domains. |
| Social Proof | ||
| G2 Rating | 4.7 (159 reviews) Backed by verified G2 reviews. | 4.5 TrustPilot Rated on TrustPilot instead. |
| Automation | ||
| API Support | API + MCP Full API access plus MCP protocol support. | Not specified API details aren't published. |
| Integrations | ||
| One-Click Integrations | Instantly, Smartlead, Saleshandy One-click connections into major sending platforms. | Major platforms Integrates with the popular cold email tools too. |
Maildoso vs Zapmail: Cost at 100+ Mailboxes
Maildoso comes out cheaper at every volume level tested. At 50 mailboxes, its SMTP fleet runs $95 to $125/mo against Zapmail Growth's $164/mo (30 included plus 20 extras at $3.25). At 100 mailboxes, Maildoso lands at $190-$250/mo versus Zapmail Pro's $299/mo.
That gap holds steady: Maildoso saves roughly 30 to 45 percent over Zapmail across the board. The trade-off is SMTP versus Google Workspace — if Google Workspace deliverability is worth paying up for, Zapmail makes sense. If volume and cost efficiency matter more, Maildoso is the clear winner.
Key takeaways
- At 50 mailboxes: Maildoso ~$110/mo against Zapmail's ~$164/mo
- At 100 mailboxes: Maildoso ~$220/mo against Zapmail's $299/mo
- Maildoso runs 30-45 percent cheaper at every scale tested
- The trade-off comes down to SMTP pricing versus Google Workspace deliverability
Mailbox Quality and Setup
Zapmail's Google Workspace mailboxes inherit trust signals from the wider Google ecosystem, and its AI domain generator and mailbox namer cut down on manual setup work. Pre-warmed accounts mean campaigns can launch sooner. Maildoso's SMTP mailboxes lean more heavily on IP reputation for deliverability.
Its Combo tier adds Google Workspace, but at a higher price ($2-$3/mailbox). What Maildoso brings instead is the strongest scale proof in the category: 400,000-plus active mailboxes and over 10 million emails processed every day.
Key takeaways
- Zapmail: Google Workspace mailboxes, AI tooling, pre-warmed accounts
- Maildoso: SMTP at scale, 400K+ mailboxes under management
- Maildoso's Combo tier adds Google Workspace at $2-$3/mailbox
Maildoso vs Zapmail: Which One Fits Your Use Case
Go with Maildoso if cost per mailbox is what matters most and Sendbox will be covering warmup and deliverability monitoring for you. It's the cheapest way to spin up a large mailbox fleet quickly. Go with Zapmail if you specifically want Google Workspace mailboxes with pre-warmed accounts and AI-assisted setup.
The higher price buys better default deliverability and a faster path to your first campaign. Worth considering as a third option: InboxKit's Agency tier ($81/mo for 30 mailbox slots, an effective $2.70 each) or Enterprise ($250/mo for 100 slots at $2.50 each) bundles in the verifier, placement testing, and blacklist checker, with Email Warmup priced separately at $3/mailbox.
Key takeaways
- Maildoso: best for budget-driven, high-volume provisioning
- Zapmail: best when Google Workspace, AI setup, and pre-warmed accounts all matter
- InboxKit: strong overall value, GWS at $2.50 with deliverability tools bundled in
Pros & Cons
Maildoso
Strengths
- Lowest starting price on a per-mailbox basis, $1.90/mo
- 400K+ mailboxes under management, 10M+ emails sent daily
- 4.7-star G2 rating across 159 reviews
- Domains priced from $2 each
- Both API and MCP support available
- One-click connections to major sending platforms
Limitations
- Base tier is SMTP-only
- Accounts aren't pre-warmed
- No AI tools for domain or mailbox naming
- No native warmup or deliverability tooling
Zapmail
Strengths
- Google Workspace mailboxes with strong default deliverability
- AI-driven domain and mailbox naming
- Accounts arrive pre-warmed for a fast ramp
- 1M+ mailboxes provisioned across 330K+ domains
- 4.5-star rating on TrustPilot
Limitations
- Costs more per mailbox: $3.00-$3.90 versus $1.90-$2.50
- A base fee ($39-$299/mo) applies on top of the per-mailbox rate
- Google Workspace only, with no SMTP option
- No native placement testing or verification
Got questions? We've got answers.
Still stuck? Talk to us →Yes. Maildoso's SMTP mailboxes start at $1.90 each with no base fee, while Zapmail starts at $39/mo plus $3.00-$3.50 per extra mailbox. That works out to Maildoso running 30-45 percent cheaper across every volume level.
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