Head to head

InboxEagle vs Mailflow

Same facts, side by side: starting price, free tier, MCP, API and what each one is actually built for.

InboxEagle

$39/mo

InboxEagle monitors inbox placement, authentication, and blocklists from $39/mo flat, any list size, with 10 seed inboxes included on Email Deliverability.

Where InboxEagle fits

  • Klaviyo senders who want inbox placement and DNS alerts without a consultant
  • Agencies watching several brands from one command center
  • Teams that need seed-list folder movement beyond the included 10 inboxes
  • High-volume senders who also want a monthly deliverability retainer

Mailflow

$49/mo

Mailflow sells email infrastructure and deliverability for outbound teams. The listing floor is $49/mo.

Where Mailflow fits

  • Outbound teams standing up sending domains and mailboxes in bulk
  • Agencies that want infra plus deliverability without a $599 EmailBison bill
  • RevOps replacing Google Workspace inboxes used only for cold mail
  • Senders who already have a sequencer and need cleaner pipes

At a glance

DetailInboxEagleMailflow
Starting price$39/mo$49/mo
Free tier–No–No
MCP server–No–No
Public API–No–No
Listed underDeliverabilityDeliverability

Where they pull apart

InboxEagle

Stands out: The $39/mo Email Deliverability SKU is flat regardless of list size, and bundles Google Postmaster, Klaviyo campaign sync, SPF/DKIM/DMARC alerts, and an AI agent that opens incidents when placement breaks.

Watch out: Ten seeds are included. Extra seed-list panels start at $49/mo for 25 seeds. DMARC aggregate processing and Audience Selection are separate SKUs. Consulting retainers start at $499/mo.

Not the right fit for

  • Cold-email inbox warmup shops (this is monitoring, not infrastructure or warmup)
  • Senders who need 200+ seed tests in the $39 SKU. That is a separate seed-list product

Mailflow

Stands out: The product is the mailbox and domain layer (infra plus deliverability), not a copy editor and not a LinkedIn sequencer.

Watch out: You still attach a sequencer such as Instantly or Smartlead on top. Mailflow is the pipes, not the cadence UI.

Not the right fit for

  • Users who only need a Gmail merge add-on
  • Teams shopping for LinkedIn automation

Pros and cons

InboxEagle

  • Email Deliverability is $39/mo flat, any list size, with 10 seeds
  • Klaviyo plus Google Postmaster on the monitoring SKU
  • AI incident agents open and close placement/authentication issues
  • Only 10 seeds in the $39 plan. Larger panels are extra
  • DMARC volume processing and audience AI are separate subscriptions
  • No published product trial on monitoring. Consulting gets a 30-minute scoping call

Mailflow

  • Infra-plus-deliverability at a $49/mo listing floor
  • Aimed at outbound volume, not internal Gmail
  • Cheaper entry than EmailBison's $599/mo listing
  • Not a LinkedIn or multichannel sequencer
  • Mailbox counts at $49 need a live check
  • Overlap with Instantly plans that already include warmup

What each one costs

InboxEagle

$39/mo

Email Deliverability is $39/mo flat, any list size, with 10 seed inboxes, Postmaster, Klaviyo sync, and authentication alerts. Seed List Testing starts at $49/mo for 25 seeds. DMARC Processing starts at $20/mo. Audience Selection starts from $39/mo. Consulting retainers: Growing $499, Established $999, Enterprise $1,999 per month. Confirm current terms on the vendor site.

Checked 19 Sep 2026

Mailflow

$49/mo

Mailflow lists from $49/mo for outbound email infrastructure and deliverability. Confirm live mailbox, domain, and IP counts on the vendor pricing page. Confirm current terms on the vendor site.

Checked 19 Sep 2026

Common questions

Is InboxEagle cheaper than Mailflow?
InboxEagle starts lower, at $39/mo against $49/mo for Mailflow. That is the entry plan on each side, so the real number depends on seats and the tier you land on.
Can you try InboxEagle or Mailflow for free?
Neither carries a free tier on our listing.

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Editorial listings, never paid rankings. Prices checked 19 Sep 2026. Confirm current terms on the vendor site. Spot an error?