What does it mean to warm up an inbox?

Email warmup is the process of preparing a new or long-inactive email account for future email outreach and campaigns. It is especially useful for cold email inboxes, which usually suffer from lower deliverability rates.

Why do I need to warm up my inbox?

Over time, cold email inboxes inevitably suffer from deliverability issues. A well-administered email warmup reverses this process and helps you maintain and improve your deliverability and sender reputation.

How does Warmup Inbox work?

You connect your inbox to the platform and the service interacts with it by replying to emails, marking them as important, and removing them from spam folders. The platform continuously monitors your email health across multiple metrics including DNS settings, DMARC, DKIM, SPF, domain age, and blacklist status.

How many inboxes are in the network?

The network has 30,000+ real inboxes, so everyone who syncs a new email address to the platform has enough reputable inboxes to interact with for the lifetime of their subscription.

Plans start at $19 per inbox per month for monthly billing, or $15 per inbox per month for annual billing. A 7-day free trial is available with no credit card required.

Email & notification APIs · Slovakia

Warmup Inbox

Email warmup service that improves deliverability and sender reputation

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Community votes: 0
DR by Ahrefs: 62 no change since last check

Ahrefs Domain Rating benchmarked 16 Oct 2026, rebuilt 11 Oct 2026.

Warmup Inbox metrics

Benchmarks for warmupinbox.com: Ahrefs Domain Rating and Majestic link data, with the change since the last build.
Metric	Value
Domain Rating	62 no change since last check
Trust Flow	29 no change since last check
Citation Flow	46 no change since last check
Referring domains	1,824 no change since last check
External backlinks	4,938 no change since last check

Ahrefs Domain Rating benchmarked 16 Oct 2026, rebuilt 11 Oct 2026. Main build topic: Computers/Internet/Web Design and Development (29). Majestic benchmarked 11 Oct 2026, rebuilt 11 Oct 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

Warmup Inbox domain build sheet

Public RDAP record, last read 16 Oct 2026, 14:22 UTC.
Domain age	6 years
Registered	25 Jun 2020
Expires	25 Jun 2035
Registrar	NameCheap, Inc.
DNSSEC	Signed

Inspect warmupinbox.com's registration

Warmup Inbox helps cold email senders improve deliverability by syncing their inboxes to a network of 30,000+ real inboxes that interact with and protect emails

What it is

Screenshot of the Warmup Inbox homepage — warmupinbox.com, as visitors see it

Warmup Inbox is an email warmup service designed for cold email senders, sales teams, marketers, recruiters, and outreach specialists. The platform syncs your inbox to a network of 30,000+ real inboxes that engage with your emails by replying, marking them as important, and removing them from spam folders. This interaction restores sender reputation and trains mail servers to view emails as legitimate. The service continuously monitors email health across multiple metrics including spam folder placement, DNS configuration, DMARC, DKIM, SPF, domain age, and blacklist status, providing reports and recommendations to maintain high deliverability. It supports all major email providers including Gmail, Outlook, Yahoo, iCloud, and others. Users can start with a 7-day free trial requiring no credit card.

What it is built with

Sync inbox to network of 30,000+ real inboxes
Automated interactions: replies, marking as important, removing from spam
Email health monitoring and reports
Spam filter monitoring
Email reputation check
Outreach sequences
Custom warm up settings (Pro plan)
Scheduled warm up (Pro plan)

Pricing

Pricing model: Freemium

See Warmup Inbox's full pricing (new tab)

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Questions from the bench

What does it mean to warm up an inbox?: Email warmup is the process of preparing a new or long-inactive email account for future email outreach and campaigns. It is especially useful for cold email inboxes, which usually suffer from lower deliverability rates.
Why do I need to warm up my inbox?: Over time, cold email inboxes inevitably suffer from deliverability issues. A well-administered email warmup reverses this process and helps you maintain and improve your deliverability and sender reputation.
How does Warmup Inbox work?: You connect your inbox to the platform and the service interacts with it by replying to emails, marking them as important, and removing them from spam folders. The platform continuously monitors your email health across multiple metrics including DNS settings, DMARC, DKIM, SPF, domain age, and blacklist status.
How many inboxes are in the network?: The network has 30,000+ real inboxes, so everyone who syncs a new email address to the platform has enough reputable inboxes to interact with for the lifetime of their subscription.
What is the pricing?: Plans start at $19 per inbox per month for monthly billing, or $15 per inbox per month for annual billing. A 7-day free trial is available with no credit card required.

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