Warmup InboxChecked by Vetteroo review

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What it is

Email warmup and inbox placement monitoring for cold email senders

Best for

Cold email senders who want new inboxes to land outside spam

Price

Free plan; Basic $15/inbox/mo yearly

Prices checked

October 31, 2026

We researched Warmup Inbox's official pricing, terms, product pages, help pages and outside reviews. We haven't used Warmup Inbox ourselves, so this is a research-based review, not a hands-on test.

Who it’s best for

• Sales teams and founders sending cold email from new domains or inboxes.
• Agencies that manage many client inboxes and want one dashboard.
• Recruiters and marketers whose emails have started landing in spam.

Who should skip it

• Probably not the best fit for anyone sending to purchased lists, or for newsletters sent through an email service that already manages reputation for you.

How it works day to day

This part draws on Warmup Inbox’s own product pages, help center and documentation, read October 31, 2026 (listed under Sources). We haven’t used Warmup Inbox ourselves.

Connect an inbox, let it trade warmup emails with other real inboxes for a few weeks, and check the dashboard for spam and inbox placement before starting outreach.

Key features in use

• Automated warmup emails and replies
• Spam and category placement monitoring
• Email reputation check
• Outreach sequences
• Language and ESP-specific warmup (Pro)
• Developer API

Setup and learning curve

Sign up with an email address, connect each inbox by Google, Microsoft or IMAP/SMTP, and choose a warmup volume.

Integrations

Gmail, Microsoft 365 and other IMAP/SMTP inboxes; an API for developers.

Support

Live chat and a knowledge hub.

Real-world use cases

• Warming a new sending domain
• Recovering an inbox that slipped into spam
• Agencies warming client inboxes
• Checking placement before a campaign

What it costs

Prices checked October 31, 2026, from Warmup Inbox’s own pricing page unless noted. Prices change often, so check the official page before you buy.

• Freemium: $0 forever for unlimited inboxes, 15 warmup emails a week.
• Basic: $15 per inbox a month billed yearly ($180/year), or $19 month to month; 75 warmup messages a day.
• Pro: $49 per inbox a month billed yearly, or $59 month to month; 250 warmup messages a day.
• Max: $79 per inbox a month billed yearly, or $99 month to month; 1,000 warmup messages a day.
• Per-inbox price drops as you add inboxes (Basic falls to $7.50 a month yearly at 50 inboxes); custom quotes above 50.

What we like

• Free plan with unlimited inboxes, plus a 7-day trial of paid plans with no card required.
• Published per-inbox prices with volume discounts.
• Spam and category placement monitoring and a reputation check on every paid plan.
• Trustpilot shows 4.6 out of 5 from about 162 reviews (checked October 31, 2026).

What to watch for

• Warmup creates artificial sends and replies between inboxes; mailbox providers do not endorse it, and it cannot fix a poor list or spammy content.
• You must give it IMAP/SMTP or similar access so it can send and reply as you.
• Fees are non-refundable except where consumer law requires a refund, per its terms.
• Support is chat only, and its terms promise no response times.

The fine print

• Subscriptions renew automatically; downgrades take effect at the next billing period, and inboxes drop to the free plan when a subscription ends unless you remove them.
• Its terms allow one free trial per person.
• Warmup does not replace authentication: set up SPF, DKIM and DMARC and follow Gmail and Yahoo bulk-sender rules.
• Legitimacy signals we found: its terms name CyberPanda s. r. o. (company ID 52441121), registered in Bratislava, Slovakia; its Trustpilot profile is claimed and showed 4.6 out of 5 from about 162 reviews as of October 31, 2026, with replies to most negative reviews; it also has reviews on Capterra.

The main alternative: MailReach Checked by Vetteroo

MailReach is another email warmup and deliverability tool for cold email senders, priced per mailbox.

What it costs: $25/mailbox/month, checked October 30, 2026

Read our full MailReach review

Pick Warmup Inbox if you…

• want a free plan to warm many inboxes lightly.
• want per-inbox discounts as you grow.
• want placement tests and reputation checks included.

Pick MailReach if you…

• want a second warmup network to compare results.
• only need a few mailboxes.
• prefer its spam-test tools.

Our take

Warmup Inbox is a well-reviewed, clearly priced warmup tool with a useful free plan; it helps new inboxes build a sending history, but it is not a fix for bad lists or content.

Side by side

From our company records. Check the official pages for current prices.

Affiliate link. We may earn a commission at no extra cost to you. How we get paid

What we checked

• Warmup Inbox's pricing, product pages and terms, read October 31, 2026
• Warmup Inbox's Trustpilot profile, read October 31, 2026
• MailReach's details: from our published review and its official pages, October 31, 2026
• The other official and outside pages listed under Sources (links checked October 31, 2026)

Sources

• Warmup Inbox (official site)
• Warmup Inbox pricing
• Warmup Inbox terms
• Warmup Inbox on Trustpilot
• Warmup Inbox on Capterra

How we review

We read the company's own terms, test the sign-up or booking steps where we can, and compare it with alternatives. A commission never changes what we write. Read our disclosure.