Is Zapmail more expensive than InboxKit?

Yes. InboxKit charges $2.50/mailbox with no base fee. Zapmail effective cost is $2.99-$3.90/mailbox plus base fees of $39-$299/mo. InboxKit is cheaper at every volume level.

Does Zapmail include warmup?

Zapmail provides pre-warmed accounts, but no ongoing warmup tool. For continued warmup management, use SendKit which includes unlimited AI warmup on every plan.

Is the AI domain generator worth the extra cost?

The AI domain and mailbox naming tools save setup time but are a one-time benefit. The ongoing per-mailbox premium of $0.50-$1.40 over InboxKit adds up at scale. Worth it for small setups, less justified at 100+ mailboxes.

Does Zapmail work with SendKit?

Yes. Connect Zapmail Google Workspace mailboxes to SendKit for AI warmup, multi-step sequences, and campaign management.

Zapmail Pricing: Plans and Real Costs

Full breakdown of every Zapmail plan, per-mailbox cost, and what you pay at scale. Here is the real cost and how it compares to InboxKit.

2 min readUpdated Mar 2026

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Bottom line

Zapmail uses tiered pricing with base fees plus per-mailbox charges. Effective per-mailbox cost ranges from $2.99 to $3.90. That is the highest per-mailbox rate of any provider on this list.

The AI tools and pre-warmed accounts partially justify the premium, but InboxKit offers Google Workspace at $2.50/mailbox with more deliverability tools.

Zapmail Plans

Plan	Price	What you get	Watch out for
Starter includes 10 mailboxes	$39/mo	10 Google Workspace mailboxes included $3.50 per additional mailbox AI domain name generator AI mailbox namer Pre-warmed accounts Workspace-level isolation	Effective cost: $3.90/mailbox at 10 mailboxes Only 10 mailboxes included in base price No inbox placement testing No email verifier or blacklist checker
Growth includes 30 mailboxes	$99/mo	30 Google Workspace mailboxes included $3.25 per additional mailbox All Starter features Priority support	Effective cost: $3.30/mailbox at 30 mailboxes Still no deliverability tools $3.25 per extra mailbox adds up
Pro includes 100 mailboxes	$299/mo	100 Google Workspace mailboxes included $3.00 per additional mailbox All Growth features Dedicated support	Effective cost: $2.99/mailbox at 100 mailboxes Highest base fee in the market Still no inbox placement testing or verification

What's Not Included

Base fees on every tier

Unlike InboxKit ($2.50/mailbox, no base fee) or Maildoso (per-mailbox only), Zapmail charges a base monthly fee on every plan. Starter is $39/mo, Growth is $99/mo, and Pro is $299/mo. These base fees increase the effective per-mailbox cost, especially at lower volumes.

$39-$299/mo base

No warmup tool beyond pre-warming

Zapmail provides pre-warmed accounts, but there is no ongoing warmup tool. Once your accounts are active and sending, you need warmup management from your sending tool. SendKit includes unlimited AI warmup on every plan.

$0 with SendKit

No inbox placement testing or verification

Zapmail does not include inbox placement testing, email verification, or blacklist monitoring. These come from your sending platform. SendKit includes all three on every plan.

$0 with SendKit, varies standalone

All-inclusive from $99/mo

Dedicated IPs, warmup, validation, inbox testing, blacklist monitoring. No add-ons.

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Zapmail vs SendKit

	Zapmail
Effective Cost (10 mailboxes)	$3.90/mailbox
Effective Cost (30 mailboxes)	$3.30/mailbox
Effective Cost (100 mailboxes)	$2.99/mailbox
Base Monthly Fee	$39-$299/mo
Google Workspace	Yes
Microsoft 365	No
Built-in Warmup	Pre-warmed only
AI Domain Generator	Yes
AI Mailbox Namer	Yes
Inbox Placement Testing	No
Email Verifier	No

Total cost at different scales

30 mailboxes

Infrastructure cost only

Zapmail

$99/mo

SendKit

N/A (sending platform)

100 mailboxes

Add SendKit from $99/mo for sending

Zapmail

$299/mo

SendKit

N/A

300 mailboxes

Contact Zapmail for enterprise pricing

Zapmail

Custom

SendKit

N/A

How Zapmail Pricing Works

Zapmail uses tiered pricing with a base monthly fee that includes a set number of mailboxes, plus a per-mailbox rate for extras. Starter includes 10 mailboxes for $39/mo ($3.90 effective). Growth includes 30 for $99/mo ($3.30 effective).

Pro includes 100 for $299/mo ($2.99 effective). The per-mailbox rate improves at higher tiers, but the base fees make Zapmail the most expensive provider at lower volumes. At 10 mailboxes, you pay $3.90 each.

InboxKit charges $2.50/mailbox at any volume with no base fee.

Key takeaways

Starter: $39/mo for 10 mailboxes ($3.90 effective)
Growth: $99/mo for 30 mailboxes ($3.30 effective)
Pro: $299/mo for 100 mailboxes ($2.99 effective)
Extra mailboxes: $3.00-$3.50 depending on tier

Cost Comparison at Scale

At 30 mailboxes: Zapmail Growth $99/mo, InboxKit $75/mo, Maildoso $57-$75/mo. At 100 mailboxes: Zapmail Pro $299/mo, InboxKit $250/mo, Maildoso $190-$250/mo. At 150 mailboxes: Zapmail Pro + 50 extra at $3.00 = $449/mo, InboxKit $375/mo, Maildoso $285-$375/mo.

Zapmail is the most expensive at every volume level. The premium is for Google Workspace, AI tools, and pre-warmed accounts.

Key takeaways

30 mailboxes: Zapmail $99 vs InboxKit $75 vs Maildoso ~$66
100 mailboxes: Zapmail $299 vs InboxKit $250 vs Maildoso ~$220
Zapmail is most expensive at every volume level
Premium pays for GWS, AI tools, and pre-warmed accounts

All-inclusive from $99/mo

Dedicated IPs, warmup, validation, inbox testing, blacklist monitoring. No add-ons.

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Keep reading

Sources

zapmailG2 Website

sendkitG2 Website

frequently asked questions

Got questions? We've got answers.

Zapmail effective per-mailbox cost ranges from $2.99 (Pro, 100 mailboxes) to $3.90 (Starter, 10 mailboxes). Extra mailboxes cost $3.00 to $3.50 depending on your plan tier.

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