Warmup Inbox review
Automated email warmup service that builds sender reputation using a network of 30,000+ real inboxes.
By Noahlast updated pricing verified
Warmup Inbox screenshots & video
Warmup Inbox in 20 seconds
Best for: Cold-email SDR teams and agencies warming up multiple client sending domains before outbound campaigns.
Pricing: From $15/inbox/month (Basic, 75 messages/day) up to $79/inbox/month (Max, 1,000 messages/day), billed monthly; annual billing saves 20%; custom quotes required past 50 inboxes.
- Warmup Inbox routes engagement through a network of 30,000+ real human inboxes across 25+ email providers.
- Plans are priced per inbox per month: Basic $15 (75 warmup messages/day), Pro $49 (250 messages/day), Max $79 (1,000 messages/day).
- Annual billing is advertised as saving 20% versus monthly billing.
- There is no permanent free tier; the product offers a 7-day free trial with no credit card required.
- The service checks 100+ blacklists daily and automatically runs delisting/rescue when an inbox gets flagged.
- Warmup Inbox holds a 4.6/5 average rating on G2, Trustpilot, and Capterra.
Limitations: No permanent free plan, only a time-limited trial.; Per-inbox pricing scales fast for agencies managing many client domains.; Custom templates, language warmup, and specific ESP warmup require the Pro or Max tier.; Pricing beyond 50 inboxes is unpublished and requires a sales call.
Top alternatives: Instantly, Lemwarm (lemlist), Warmy, Mailwarm, Folderly, Warmbox — full list
What is Warmup Inbox?
Warmup Inbox is an email warmup and deliverability-monitoring service built by CyberPanda s.r.o. It is used by cold-email sales teams, agencies, recruiters, and marketers to raise a new or damaged sending domain's inbox placement before running outbound campaigns. Instead of simulated engagement, it routes email through a network of over 30,000 real inboxes that open, reply to, and rescue messages from spam, while a dashboard tracks inbox placement, sender reputation, and blacklist status in real time.
Warmup Inbox is a deliverability tool that connects to Gmail, Outlook, or any SMTP inbox and exchanges automated opens, replies, and "mark as important" signals with a network of 30,000+ real human inboxes across 25+ providers. It monitors 100+ blacklists daily and auto-runs delisting when a sending domain gets flagged. Plans run $15 to $79 per inbox per month depending on daily warmup volume, with custom pricing past 50 inboxes.
Standout feature: Warmup traffic runs through 30,000+ real human inboxes rather than simulated/scripted engagement, which the vendor's internal benchmark puts at 15 percentage points higher Primary-inbox placement than competing warmup tools, plus automatic blacklist rescue checked against 100+ blacklists daily.
Biggest weakness: Pricing is strictly per-inbox with no free tier: warming 10 inboxes on the Pro plan runs $490/month, and agencies managing dozens of client domains must book a sales call for custom pricing past 50 inboxes since rates above that point aren't published.
Warmup Inbox: pros and cons
Pros
- Network of 30,000+ real inboxes across 25+ providers instead of shared fake mailbox pools
- Automatic blacklist monitoring and rescue across 100+ blacklists, checked hourly
- Connects to Gmail, Outlook/Microsoft 365, Yahoo, Zoho, custom SMTP, and Amazon SES
- 7-day free trial with no credit card required
- 4.6/5 average rating across G2, Trustpilot, and Capterra
Cons
- No permanent free plan, only a 7-day trial
- Per-inbox pricing scales linearly, making multi-inbox agency use expensive fast
- Custom template control, language warmup, and specific ESP warmup are locked behind the Pro and Max tiers
- Pricing above 50 inboxes is not published and requires a sales call
Warmup Inbox pricing
From $15/mo · verified from the vendor's pricing page
| Plan | Price | Notes |
|---|---|---|
| Basic | $15/mo | 75 warmup messages/day per inbox, up to 25% reply rate, spam/category monitoring, dashboards |
| Pro | $49/mo | 250 warmup messages/day per inbox, custom templates, language warmup, priority support |
| Max | $79/mo | 1,000 warmup messages/day per inbox, premium support, unlimited developer API, early feature access |
What reviewers say
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