What Warmup Inbox does

Warmup Inbox is a SaaS email deliverability platform operated by CyberPanda s.r.o. (Slovak Republic) that helps senders improve inbox placement through automated reputation building. Its core mechanism is a network of 20,000+ real, human-operated inboxes (minimum 15,000+ active at any time) that engage in automated send/reply cycles, mark messages as important, and rescue emails from spam folders, generating positive engagement signals that email providers interpret as legitimate activity. The platform connects to user inboxes via IMAP, SMTP, or OAuth and supports Gmail, Microsoft 365/Outlook, Zoho Mail, and SendGrid, as well as any SMTP/IMAP-compatible custom provider. Beyond warmup, it offers IP Warmup, Language Warmup (ICP-aligned content), an ESP-specific Warmup Tool, Cold Email Sequence automation, Reputation Score monitoring with alerting, and continuous blacklist monitoring.

The company serves sales professionals, marketers, lead generation specialists, and recruiters who run cold or high-volume email outreach and need their messages to land in primary inboxes rather than spam or promotions folders. It is part of the Itrinity portfolio, which also includes UptimeRobot, Mangools, and EmailListVerify, giving it reputational and operational backing. The business model is pure product-led growth with a self-serve 7-day free trial (no credit card required), simple per-inbox subscription pricing ($19/month or $15/month on annual billing), and an API-first OEM channel that enables other SaaS products to embed warmup as a white-label feature (documented partner: Leadspicker). An extensive suite of free deliverability tools (DMARC/SPF generators, spam checkers, blacklist checkers, email validators, etc.) and a 20% recurring affiliate program drive top-of-funnel acquisition. Customers include named logos such as Mangools, Wishpond, SellersCommerce, Italian Artisan, Avvy.co, Aerosend, I-batu, and Leadspicker, spanning SEO, e-commerce, marketing automation, and lead generation verticals. Revenue is not publicly disclosed and the company operates with a 1-10 person team.

Name

Warmup Inbox

Legal name

CyberPanda s.r.o.

Website

https://warmupinbox.com

Company type

Private

Founded year

2020

Operating status

Operating

Headcount range

1–10 employees

Short description

Warmup Inbox is a SaaS email warmup platform using a 20,000+ real-inbox network to automate sender reputation building for sales, marketing, lead generation, and recruiting professionals. It operates globally via self-serve per-inbox subscriptions and an API/OEM channel, and is part of the Itrinity portfolio.

Ownership category

akta.pro rank

Headquarters

HQ city

Prague

HQ country

Czechia

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Personnel, Infrastructure, Marketing or Sales, Operations

Revenue model

1. Subscription - Per Inbox: SaaS subscription model billed per inbox per month or per year. Users connect email accounts and pay for each inbox they warm up. Pricing is straightforward: $19/month per inbox or $15/month per inbox when paid annually. A free 7-day trial is available without a credit card. No limit on the number of inboxes per user.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

Warmup Inbox is a SaaS email deliverability platform that uses a network of 20,000+ real inboxes to automatically send, receive, and engage with emails on behalf of users, gradually building sender reputation so cold outreach and marketing emails land in primary inboxes instead of spam or promotions folders. The platform connects to Gmail, Outlook, Zoho, SendGrid, and any SMTP/IMAP-compatible provider, and bundles reputation scoring, blacklist monitoring, IP warmup, language warmup, and cold email sequencing capabilities.

Product overview

Warmup Inbox is a unified SaaS platform centered on email deliverability and sender reputation management. Its core product is the Warmup Inbox platform, which uses a network of 20,000+ real inboxes to automatically send, receive, and engage with emails, building sender reputation to help cold email campaigns land in primary inboxes. The platform is modular: it includes Email Warmup (the core engine), IP Warmup for IP reputation building, Language Warmup for targeting specific audiences, ESP Warmup Tool for provider-specific optimization, and Cold Email Sequence for managing outreach campaigns. Pricing is straightforward at $15/inbox/month annually or $19 monthly, with free tools available for email health monitoring.

Differentiator

Problem solved

Functional benefit

Products and services

• Warmup Inbox Platform A SaaS email warmup platform that improves email deliverability by building sender reputation through automated send, reply, and engagement cycles across a network of 20,000+ real inboxes, connecting to Gmail, Outlook, Zoho, SendGrid, and any SMTP/IMAP-compatible provider.

Quantifiable outcome

• Reach more inboxes and leads by keeping inbox in good condition
• +4 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

Feature8 records

Partnerships

Five partnerships are on record, tiered core and minor.

• LeadspickercoreOEM/ Whitelabel/ Licensing PartnerLeadspicker integrated Warmup Inbox directly into their platform via API, saving an estimated 2 years of development time. They offer email warmup as a built-in feature to their own customers, effectively white-labeling the warmup functionality. A detailed case study documents the partnership outcomes.
• Gmail / Google WorkspacecoreTechnology or IntegrationWarmup Inbox integrates with Gmail and Google Workspace via OAuth, enabling users to warm up their Gmail inboxes. Gmail warmup is one of the primary use cases and supported through official integration.
• Microsoft 365 / OutlookcoreTechnology or IntegrationWarmup Inbox integrates with Microsoft 365 (Outlook/Exchange) via OAuth/IMAP, allowing users to warm up their Outlook inboxes. Outlook warmup is a primary supported provider.
• WorldStream B.V.minorOthersInfrastructure hosting provider. WorldStream B.V. is listed as an authorized sub-processor in the Data Processing Agreement, providing infrastructure hosting services from the Netherlands (EEA). Data transfers to this vendor are within the EEA.
• Stripe Payments Europe, Ltd.minorOthersPayment processing provider. Stripe Payments Europe, Ltd. is listed as an authorized sub-processor in the Data Processing Agreement, handling limited billing data for payment processing. Data processing is within the EEA (Ireland).

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Lemwarm: Email warmup SaaS operated by Lemlist, one of the most established players in the cold-outreach ecosystem. Directly comparable product offering (network-based warmup), pricing model, and target customer (cold email senders, sales teams, lead-gen agencies).
• Warmy: AI-driven email warmup and deliverability platform with auto-reply network, reputation monitoring, and ESP integrations. Directly competes in the same warmup category, serving similar sales and marketing personas.
• Folderly: Email deliverability platform offering warmup, spam testing, placement monitoring, and content optimization. Closely comparable in product breadth (warmup + deliverability testing + monitoring) and target market.
• Mailwarm: Email warmup service that builds sender reputation through automated conversations. Direct head-to-head competitor at similar price points and targeting the same sales and lead-gen personas.
• Warmbox: AI-powered email warmup tool with a network of real inboxes for reputation building. Comparable product mechanism, target audience, and self-serve PLG model.
• InboxAlly: Email deliverability and warmup platform focused on improving sender reputation and inbox placement. Overlapping feature set including reputation monitoring and ESP-specific optimizations.
• Mailreach: Email warmup service with automated interactions and spam rescue features. Targets the same cold-email sender and SDR persona with comparable per-inbox pricing.
• GlockApps: Email deliverability testing, spam analysis, and IP reputation monitoring with warmup capabilities. Directly comparable on the deliverability-testing and monitoring dimensions; broader incumbent in the category.

Broad incumbents

• Validity (ReturnPath): Enterprise email deliverability and sender-reputation platform (parent of ReturnPath, BriteVerify, Everest). Much larger and broader incumbent covering deliverability, validation, and certification — adjacent but not direct warmup competition.
• ZeroBounce: Email validation, deliverability, and list-hygiene platform with some warmup/reputation monitoring features. Comparable customer base (sales/marketing email senders) but broader email-data services rather than core warmup focus.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/WarmupInbox
• Facebookfacebook.com/Warmup-Inbox-100529225381560

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Warmup Inbox