# Mailwarm **Source:** https://geo.sig.ai/brands/mailwarm **Vertical:** Marketing **Subcategory:** Marketing Automation **Tier:** Emerging **Website:** mailwarm.com **Last Updated:** 2026-04-14 ## Summary Rouen France YC W20 email warmup at $50K MRR within months of launch with 2 employees; $150K seed automated inbox placement and sender reputation for cold outreach competing with Lemwarm and Warmbox. ## Company Overview Mailwarm is a Rouen, France-based email deliverability and warmup platform — backed by Y Combinator (W20) with $150,000 in seed funding in 2020 — providing businesses and sales teams using cold outreach with automated email warmup services that improve sender reputation and inbox placement by simulating positive email interactions with a network of real email accounts. Founded in 2020 by Amine Benjelloun and Gonzague Hacher, Mailwarm reached $50,000 in monthly recurring revenue within months of launch with a 2-person team, serving businesses that rely on cold email outreach for lead generation and need to avoid the spam filters that flag new sending domains and low-reputation email accounts. Mailwarm's email warmup platform addresses the cold start problem for email senders: a new Google Workspace domain or email account has zero sending reputation — email providers (Gmail, Outlook, Yahoo) have no history to evaluate for spam scoring, so emails from new accounts are disproportionately filtered to spam. Professional email warmup establishes sender reputation by sending a gradually increasing volume of emails from the target account to a network of other email accounts, which open the emails, move them from spam to inbox, reply to them, and mark them as important — training email provider spam algorithms that the sender is a legitimate, engaged communicator. Mailwarm's automated warmup network (real email accounts from verified users rather than bot accounts) conducts this warmup process in the background without requiring manual inbox engagement — preparing new domains and accounts for high-volume cold outreach campaigns. In 2025, Mailwarm competes in the email warmup, email deliverability, and sales email infrastructure market with Lemwarm (email warmup by Lemlist, integrated with cold email tool), Instantly.ai (cold email platform with warmup, $300M raised at $5B valuation), and Warmbox (email warmup tool) for sales team and outbound marketers email deliverability improvement and sender reputation warmup platform adoption. Y Combinator W20 backing connects Mailwarm with the email infrastructure and sales tools investor community. The 2-person, bootstrapped-to-significant-MRR trajectory demonstrates the capital efficiency possible in email tooling where developer costs are low and market need is persistent. The 2025 strategy focuses on expanding the integration with cold email platforms (Apollo.io, Smartlead, Instantly.ai) for native warmup management, building the domain health monitoring for early spam filter detection, and growing the agency reseller program for email marketing agencies managing client sender reputation. ## Frequently Asked Questions ### What is Mailwarm? Mailwarm is an email deliverability platform founded in 2020 that provides automated email warmup services to improve sender reputation and inbox placement. The platform uses simulated positive email interactions to help businesses optimize their cold email campaigns and avoid spam filters. ### What products and services does Mailwarm offer? Mailwarm offers email warmup automation, sender reputation improvement, inbox placement optimization, email deliverability tools, and cold email optimization services. These AI-driven solutions help businesses enhance their email marketing effectiveness. ### Who is Mailwarm designed for? Mailwarm serves businesses seeking to optimize cold email campaigns, improve deliverability rates, and avoid spam filters. The platform is positioned in the email infrastructure and marketing automation space for companies running email outreach campaigns. ### When was Mailwarm founded and by whom? Mailwarm was founded in 2020 by Amine Benjelloun and Gonzague Hacher. The company was part of Y Combinator's Winter 2020 (W20) batch. ### Where is Mailwarm located? Mailwarm is headquartered in Rouen, France. ### Has Mailwarm raised any funding? Yes, Mailwarm raised $150K in seed funding in 2020. The company is backed by Y Combinator from their W20 batch. ### What are Mailwarm's key achievements and metrics? Mailwarm reported $50K in monthly recurring revenue (MRR) within months of launch in 2020. The company operates with a lean team of 2 employees while serving its customer base. ### What technology or approach does Mailwarm use? Mailwarm uses AI-driven email warmup automation that simulates positive email interactions. This approach helps improve sender reputation and inbox placement for cold email campaigns. ### How many employees does Mailwarm have? Mailwarm operates with a lean team of 2 employees. ### What are the latest developments at Mailwarm? Mailwarm achieved $50K MRR in early traction following their 2020 founding and seed funding round. The company continues to operate from their Rouen, France headquarters with their founding team. ## Tags b2b, marketing, martech, saas, startup --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*