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InboxKit

InboxKit vs Mailbloom

Mailbloom costs $2.50 down to $0.99 a mailbox, on its own infrastructure, capped at 50 sends a day. InboxKit sells official Google and Microsoft seats at $3, and Azure at $30 for up to 100.

  • No plans, no minimums
  • Unlimited team members and workspaces
  • 24/7 support on Slack, chat and email
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Free account. Pay per mailbox.

G2 High Performer, Email Deliverability, Spring 2026G2 High Performer, Small Business, Email Deliverability, Spring 20264.7 on G2 · 120 reviews

InboxKit vs Mailbloom

Checked 19 Oct
InboxKit vs Mailbloom
InboxKitMailbloom
Mailbox typeGoogle or MicrosoftIts own infrastructure
Domains you ownConnect your ownOnly at Dynadot
MCP serverClaude Code and CodexNot listed
G2 rating4.7 (120 reviews)Not on G2

Teams sending on InboxKit

  • Vectify logo
  • HeyReach logo
  • C17 Labs logo
  • Anevo Marketing logo
  • Understory logo
  • NoBroker logo
  • Zendesk logo
  • Gorgias logo
  • Expandi logo
  • LeadMagic logo

InboxKit or Mailbloom: the short answer

By InboxKit Team. Updated 20 Oct 2026. Competitor details come from Mailbloom’s own pages, linked under the table.

Choose InboxKit if

  • You want Google Workspace or Microsoft 365 seats, which Mailbloom does not sell
  • You run Microsoft volume on Azure: 100 mailboxes for $30, against $99
  • You want a REST API and an MCP server for Claude Code or Codex

Choose Mailbloom if

  • You want a lower price per mailbox: $0.99 each from 100 to 500
  • You send under 50 emails a day per mailbox and want no separate warmup charge
  • You want one warm backup inbox with every mailbox

InboxKit vs Mailbloom, line by line

Taken from public pages. Where Mailbloom publishes nothing, the cell says so.

InboxKit compared with Mailbloom
InboxKitMailbloom
MailboxesOfficial, paid Google Workspace and Microsoft 365, plus AzureOwn infrastructure, not Google Workspace or Microsoft 365; 50 sends a day each, warmup mail included
Claude Code / Codex (MCP)Remote MCP server, connects to Claude Code and CodexNot listed
At volumeAzure: $30 a tenant for up to 100 mailboxes$0.99 a mailbox from 100 to 500
PriceGoogle or Microsoft 365: $3 a mailbox, or $2.50 annual$2.50 to $0.99 a mailbox, by plan size
Plan sizeNo plans, no minimums15 to 500 mailboxes a plan
DomainsBuy or connect your ownOwned domains must be at Dynadot; new .com $8.99
Warm mailboxesPre-warmed mailboxes, live in hoursOne warm backup per mailbox at no extra cost
Warmup (add-on)14 days on an isolated network, $3 a mailbox21-day warmup per domain; no separate charge listed
Monitoring (add-on)InfraGuard, every six hours: blacklists, DNS, bounces, placement, auto-pauseSPF, DKIM and DMARC re-checked after propagation
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Price it at your volume

Common volumes, side by side, at published prices.

Monthly price at common volumes, InboxKit and Mailbloom
100mailboxesMicrosoft on one Azure tenant, against Mailbloom at $0.99InboxKit, monthly$30LowerAnnual billing-Mailbloom, monthly$99
500mailboxesMicrosoft on five Azure tenants, against Mailbloom’s largest planInboxKit, monthly$150LowerAnnual billing-Mailbloom, monthly$495
100mailboxesGoogle Workspace or Microsoft 365 at $3InboxKit, monthly$300Annual billing$250Mailbloom, monthly$99Lower

Against our $3 Google and Microsoft 365 mailboxes, Mailbloom is cheaper at every plan size. It lists no separate warmup charge, and each mailbox comes with one warm backup.

Mailbloom bills the whole plan at its band price. Bands: $2.50 from 15, $2.23 from 30, $1.88 from 50, $0.99 from 100 to 500. Each Mailbloom mailbox is capped at 50 sends a day, warmup mail included.

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InboxKit vs Mailbloom, in detail

Mailbloom pricing against InboxKit

Mailbloom bills the whole plan at one band price. Mailboxes are $2.50 each from 15, $2.23 from 30, $1.88 from 50 and $0.99 from 100 up to 500. The smallest plan is 15 mailboxes, $37.50 a month.

Domains cost extra: $8.99 for a new .com, $7.99 for a .org and $25 for an aged domain. Domains you already own connect free if they are registered at Dynadot. No separate warmup charge is listed.

InboxKit is $3 a Google or Microsoft 365 mailbox, or $2.50 on annual billing. Against our monthly rate, Mailbloom is cheaper at every plan size. On Azure, 100 Microsoft mailboxes cost $30 here against $99 there, and 500 cost $150 against $495.

Mailbloom mailboxes against Google and Microsoft seats

Mailbloom sells mailboxes on its own infrastructure and says they are not Google Workspace or Microsoft 365. Every inbox has a hard cap of 50 sends a day, warmup mail included. Each mailbox comes with one warm backup at no extra cost.

InboxKit sells official, paid Google Workspace and Microsoft 365 seats, both at $3. Microsoft volume can run on Azure, where one tenant holds up to 100 mailboxes for $30 a month. Pre-warmed mailboxes are live in hours.

Mailbloom setup and domains

Mailbloom states no setup time. You deploy mailboxes yourself, and new inboxes then go through its 21-day warmup. Domains you already own must be registered at Dynadot to connect.

InboxKit completes orders in 30 to 120 minutes, automatically, with SPF, DKIM and DMARC configured for you. You buy domains or connect your own in one click. Domain rotation and email migration are built in.

Mailbloom warmup and monitoring

Mailbloom describes a 21-day warmup tracked per domain, with no separate charge listed. It writes SPF, DKIM and DMARC on deploy and re-checks them once they propagate. It states no blacklist or placement schedule.

InboxKit’s warmup is a $3 add-on that runs for 14 days on an isolated network. InfraGuard, also an add-on, checks blacklists, DNS, bounces and inbox placement every six hours. It includes alerts, auto-pause and unlimited placement tests. Its first month is free.

Mailbloom API, MCP and sequencer exports

The Mailbloom pages we checked mention no API or MCP server of its own. Exports are files for 8 named sequencers, plus plain CSV for the rest.

Every InboxKit account gets the full REST API, with 119 endpoints and webhooks. Connect Claude Code or Codex to InboxKit’s remote MCP server. Mailboxes export in one click to 24+ sequencers.

Mailbloom reviews and support

InboxKit is rated 4.7 out of 5 on G2 from 120 reviews. We found no G2 listing for Mailbloom.

InboxKit support runs 24/7 on Slack, in-app chat and email. Every account gets unlimited team members and workspaces, so each client can have its own.

Switch from Mailbloom in four steps

  1. Create a free account

    Pay only for the mailboxes you add. No plan to pick first.

  2. Buy or connect domains

    Then add Google Workspace, Microsoft 365 or Azure mailboxes on them.

  3. Export to your sequencer

    One click to 24+ sequencers, including Smartlead and Instantly.

  4. Run both side by side

    Warm up here while Mailbloom keeps sending. Move campaigns before your plan renews.

From teams sending on InboxKit

  • G2 High Performer, Email Deliverability, Spring 2026
  • G2 High Performer, Small Business, Email Deliverability, Spring 2026
  • G2 High Performer, Asia Pacific, Email Deliverability, Spring 2026
  • G2 High Performer, India, Email Deliverability, Spring 2026

G2 High Performer, Spring 2026, rated 4.7 out of 5 from 120 reviews

  • Burned through 9 domains in 6 weeks with our old setup. Same domains have been running fine on InboxKit since March.
    Photo of LukaLukaManyreach
  • Our agency manages 40 client accounts now. Would have been impossible before this.
    Photo of Walter WinnWalter WinnAnevo Marketing
  • Our ops guy used to manually configure DNS for every mailbox. Now he's actually doing ops work instead.
    Photo of Atishay JainAtishay JainEagle Info Services

Questions about Mailbloom

Short answers, from the published prices and pages linked under the table.

  • Is Mailbloom cheaper than InboxKit?

    Against our $3 Google and Microsoft 365 mailboxes, yes, at every plan size. On Azure, 100 Microsoft mailboxes cost $30 here, against $99 for 100 at Mailbloom.

  • How does Mailbloom pricing work?

    Plans run from 15 to 500 mailboxes. The whole plan is billed at one band price: $2.50, $2.23, $1.88 or $0.99 a mailbox. Domains cost extra, from $7.99.

  • Are Mailbloom mailboxes Google Workspace or Microsoft 365?

    No. Mailbloom says its mailboxes run on its own infrastructure and are neither. Each one is capped at 50 sends a day, warmup mail included.

  • Can I use domains I already own?

    On Mailbloom, only if they are registered at Dynadot. On InboxKit you buy domains or connect your own in one click.

  • Does Mailbloom have an API or an MCP server?

    The Mailbloom pages we checked mention none of its own. InboxKit includes a REST API with 119 endpoints and a remote MCP server on every account.

  • Is Mailbloom legit?

    Mailbloom publishes its prices, plan sizes and terms on its own site. We found no G2 listing for it.

  • How do I move from Mailbloom to InboxKit?

    Open a free account, buy or connect domains, and add mailboxes. Export them in one click to your sequencer. Keep Mailbloom sending until your campaigns have moved.

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Open a free account. Pay only for the mailboxes you add.

$3 a mailbox a month, or $2.50 on annual billing. No plans, no minimums.

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