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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.
Maildoso and Zapmail are independent third-party mailbox providers, neither is a Sendbox product. This comparison is based on each provider's publicly listed pricing and features.
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.
Scoreboard
Which provider has the edge on each of the 10 rows in the table below.
A count of rows, not a weighted score, read the verdict for which differences matter most.
Feature comparison
Maildoso vs Zapmail, row by row
| Feature |  Maildoso |  Zapmail |
|---|---|---|
| Price per MailboxPricing | $1.90-$2.50/mo Edge 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. |
| Mailbox TypeInfrastructure | SMTP + Combo Plain SMTP, or the Combo option that adds Google Workspace. | Google Workspace Edge Google Workspace only. |
| Pre-warmed AccountsDeliverability | No Warmup has to come from your sending tool. | Yes Edge Accounts arrive already warmed up. |
| AI Domain GeneratorAI Tools | No Domains are picked manually. | Yes Edge AI proposes domain names built to dodge spam triggers. |
| Scale Track RecordScale | 400K+ mailboxes Manages 400,000+ mailboxes and processes 10M+ emails daily. | 1M+ mailboxes Edge Has set up 1M+ mailboxes across 330K+ domains. |
| G2 RatingSocial Proof | 4.7 (159 reviews) Edge Backed by verified G2 reviews. | 4.5 TrustPilot Rated on TrustPilot instead. |
| Domain CostPricing | From $2/domain Edge Domains start at $2 each. | Not specified Domain pricing isn't broken out separately. |
| API SupportAutomation | API + MCP Edge Full API access plus MCP protocol support. | Not specified API details aren't published. |
| One-Click IntegrationsIntegrations | Instantly, Smartlead, Saleshandy One-click connections into major sending platforms. | Major platforms Integrates with the popular cold email tools too. |
| Cost for 50 MailboxesPricing | $95-$125/mo Edge 50 mailboxes at $1.90-$2.50 each. | $164-$199/mo Growth's $99 base plus 20 extra mailboxes at $3.25 each. |
On this page7
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
Strengths and limitations
Pros & cons
Strengths6
- 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
Limitations4
- Base tier is SMTP-only
- Accounts aren't pre-warmed
- No AI tools for domain or mailbox naming
- No native warmup or deliverability tooling
Strengths5
- 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
Limitations4
- 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
Using either provider with Sendbox
Connect either provider's mailboxes into Sendbox for AI warmup, multi-step sequencing, and deliverability monitoring, both support a one-click API import. You can also skip a separate provider entirely and buy mailboxes directly through Sendbox. Coming from Instantly, Smartlead, or EmailBison? Sendbox handles that migration too, via API key.
- Mailboxes can be provisioned right inside Sendbox, no manual setup, live in about 30 minutes
- Every plan runs on dedicated IPs with isolated infrastructure
- Plays nicely with any of the infrastructure providers above (InboxKit, Maildoso, Zapmail, Mailforge)
- Migrating from Instantly, Smartlead, or EmailBison takes an API key, not a rebuild
- A 350M+ lead database comes with the platform
- Dialer, CRM, and AI reply tagging are built in rather than bolted on
- Pricing is not per seat
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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