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Warmbox

Dedicated email warmup tool with AI-driven inbox interactions and deliverability monitoring.

warmbox.ai
The Warmbox homepage at warmbox.ai
The Warmbox homepage (warmbox.ai), captured October 2026.
Email Warmup ToolsPaid Last updated: February 2026

About Warmbox.

Warmbox is a dedicated email warmup service that helps improve and maintain your sender reputation. It works by sending and interacting with emails from a network of real inboxes, mimicking natural email behavior.

The platform offers multiple warmup strategies (growth, maintain, recover), deliverability monitoring, blacklist checking, and detailed warmup analytics. Warmbox works alongside any cold email tool as a complementary service.

It is ideal for teams that use a separate cold email platform but need robust, dedicated warmup and deliverability monitoring.

Key features

  • AI-driven warmup interactions
  • Multiple warmup strategies
  • Deliverability monitoring
  • Blacklist checking
  • Warmup analytics
  • DNS record checker
  • Auto warmup scheduling
  • Inbox placement testing

Pros

  • Focused and effective warmup solution
  • Multiple warmup strategies (growth, maintain, recover)
  • Good deliverability monitoring
  • Works with any cold email tool

Cons

  • Only does warmup - not a complete outreach tool
  • Can be expensive when warming many inboxes
  • Results take 2-4 weeks to materialize
  • Limited integration options

Integrations

Google WorkspaceMicrosoft 365SMTP/IMAP

Pricing

$15/moPaid
7-day free trial

Compare Warmbox

Quick facts

G2 Rating
4.5(45 reviews)
Starting Price
$15/mo
Founded
2021
Best For
Teams that need dedicated, professional email warmup alongside their outreach tool
Company Size
Solo Small Mid-Market Agency
Website
warmbox.ai

Looking for an alternative?

See how Warmbox compares to FoxReach, the all-in-one cold email platform with built-in warmup, AI replies, and a free plan.

Compare Warmbox vs FoxReach

Questions about
Warmbox.

Warmbox starts at $15/mo. A 7-day free trial is available.

Teams that need dedicated, professional email warmup alongside their outreach tool

Key features include: AI-driven warmup interactions, Multiple warmup strategies, Deliverability monitoring, Blacklist checking, Warmup analytics.

Warmbox does not have a permanent free plan, but offers a 7-day free trial.

Top alternatives to Warmbox include FoxReach (all-in-one cold email with built-in warmup), and other tools in the email warmup category. See our full alternatives comparison.

Warmbox has a 4.5/5 rating on G2 based on 45 reviews.

Answered from the docs in a few seconds, with links to where it came from.

Try FoxReach
free.

All-in-one cold email outreach with built-in warmup, AI replies, and smart deliverability. No credit card required.