# Warmup Inbox review

Automated email warmup service that builds sender reputation using a network of 30,000+ real inboxes.

By Noah — last updated & pricing verified October 24, 2026.

> 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.

## Facts

- Website: https://warmupinbox.com
- Pricing: From $15/mo (verified )
- License: Paid
- Platforms: web
- Best for: Cold-email SDR teams and agencies warming up multiple client sending domains before launching outbound campaigns.
- 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.
- Categories: [Email Marketing & Newsletters](https://findalternative.to/categories/email-marketing)

## Pricing snapshot

| 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 |

## Pros and cons

- Pro: Network of 30,000+ real inboxes across 25+ providers instead of shared fake mailbox pools
- Pro: Automatic blacklist monitoring and rescue across 100+ blacklists, checked hourly
- Pro: Connects to Gmail, Outlook/Microsoft 365, Yahoo, Zoho, custom SMTP, and Amazon SES
- Pro: 7-day free trial with no credit card required
- Pro: 4.6/5 average rating across G2, Trustpilot, and Capterra
- Con: No permanent free plan, only a 7-day trial
- Con: Per-inbox pricing scales linearly, making multi-inbox agency use expensive fast
- Con: Custom template control, language warmup, and specific ESP warmup are locked behind the Pro and Max tiers
- Con: Pricing above 50 inboxes is not published and requires a sales call

## AI summary

- 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.
- 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.
- Top alternatives: Instantly, Lemwarm (lemlist), Warmy, Mailwarm, Folderly, Warmbox
- Limitation: No permanent free plan, only a time-limited trial.
- Limitation: Per-inbox pricing scales fast for agencies managing many client domains.
- Limitation: Custom templates, language warmup, and specific ESP warmup require the Pro or Max tier.
- Limitation: Pricing beyond 50 inboxes is unpublished and requires a sales call.

## Alternatives

7 vetted alternatives to Warmup Inbox: https://findalternative.to/warmup-inbox — top picks: Warmy, MailReach, Folderly

## Comparisons

- https://findalternative.to/compare/mailreach-vs-warmup-inbox

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