WarmupInbox
Reviewed by Alexis Morain · Updated August 2, 2026
Warmup Inbox warms up email addresses to boost deliverability and avoid spam folders. Plans start at $19/month per inbox, with a free trial.
An effective email warmup service for cold email deliverability, though its opaque vendor and per-inbox pricing are a drawback next to platforms that already include warmup.
- Automatic warmup via a network of real mailboxes
- Deliverability score and spam placement detection
- Vendor and headquarters are opaque (Sales.co ecosystem)
Warmup Inbox is an email warmup service. Its job: gradually build the sending reputation of a new or cold mailbox, so your outreach campaigns land in the inbox instead of the spam folder.
What is Warmup Inbox for?
The service automatically exchanges emails between your addresses and a network of real mailboxes: sending, opening, replying, and pulling messages out of spam. This simulated traffic signals to providers (Gmail, Outlook) that the address is trustworthy, which boosts its reputation. Warmup Inbox also measures a deliverability score and detects spam placements. It's an essential first step before any cold email campaign from a recent address.
Who is Warmup Inbox for?
It targets outreach teams and freelancers sending cold email with tools like Lemlist, Instantly, or Woodpecker. Many of these platforms now build in their own warmup feature, which makes Warmup Inbox more of a complementary or backup service. Worth noting: the vendor remains opaque, tied to the Sales.co ecosystem, and its pricing isn't clearly listed on the official site.
How much does Warmup Inbox cost?
Billing is per warmed-up mailbox. The Basic plan costs $19/month per inbox (up to 75 warmup emails a day), Pro is $49/month per inbox, and Max is $79/month per inbox. The cost scales linearly with the number of addresses, with roughly a 20% discount on annual billing and a free trial of about 7 days.
Pros & Cons
- Automatic warmup via a network of real mailboxes
- Deliverability score and spam placement detection
- Useful first step before any cold outreach campaign
- Free trial available
- Vendor and headquarters are opaque (Sales.co ecosystem)
- Pricing missing from the official site, cross-checked elsewhere
- Per-inbox billing, cost scales linearly
- Often redundant with built-in warmup in email tools
Key features of WarmupInbox
Automatic warmup
Simulated email exchanges to build sending reputation
Deliverability score
Measures how trustworthy the address is
Spam detection
Flags spam folder placements
Mailbox network
Traffic between real mailboxes to establish credibility
WarmupInbox pricing
Warmup Inbox bills per warmed-up mailbox. The Basic plan costs $19/month per inbox (up to 75 warmup emails a day), Pro $49/month per inbox, and Max $79/month per inbox. The cost scales linearly with the number of addresses, with roughly a 20% discount on annual billing and a free trial of about 7 days. Pricing isn't clearly listed on the official site and was cross-checked via third-party sources.
Basic
75 warmup emails/day · Deliverability score · Network of real mailboxes
$19 per month / inbox
Pro
Higher warmup volume · Spam detection · Detailed reports
$49 per month / inbox
Max
Maximum warmup · Priority · Advanced tracking
$79 per month / inbox
Pricing verified on July 12, 2026
Try WarmupInboxWho is WarmupInbox for?
Best for
- Cold email outreach teams
- New or cold addresses that need warming up
- Freelancers focused on deliverability
Not recommended for
- Email tools that already include native warmup
- Teams wanting a transparent vendor and hosting setup
Want to try WarmupInbox?
Head to the official site and the current offer.
Frequently asked questions about WarmupInbox
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