Mailwarm
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Mailwarm is an automated email warmup and deliverability platform designed to help businesses keep their emails out of spam folders and consistently reach the inbox.
Since 2020, Mailwarm has helped founders, sales teams, marketers, and agencies improve email deliverability, build strong sender reputation, and scale cold email outreach safely. We focus on the real fundamentals of deliverability: trust, consistency, and genuine engagement.
Mailwarm automatically warms up new domains, inboxes, and SMTP servers by generating natural interactions between real email accounts. This process protects your reputation, prevents spam filtering, and improves inbox placement across major providers including Gmail, Outlook, Microsoft 365, and Yahoo.
Key Features: - Automated email warmup for Gmail, Outlook, and Microsoft 365 - Multi-provider warmup for realistic sender reputation building - Spam score tracking to measure inbox vs spam performance - Bounce prevention and verification systems - SMTP, domain, and mailbox warmup - Easy one-click Outlook & Office365 connection - Guided SMTP setup and deliverability monitoring - Stable warmup with auto-recovery from connection issues - Team and agency management with flexible plans
Email warmup is not a hack, itโs a process. Mailwarm was built to do it properly, using real engagement signals to help your emails earn long-term trust with mailbox providers.
Whether youโre launching new outreach campaigns, onboarding new sales reps, or managing multiple client accounts, Mailwarm helps you send emails with confidence and achieve better inbox placement instead of landing in spam.
Mailwarm is not just an email warmup tool. Every plan includes an email deliverability expert who works with you to set up your infrastructure, monitor your performance, and fix issues that impact your inbox placement. Most tools show you data. Mailwarm helps you improve results.
The average person uses 11 apps daily and loses 25% of their time to context switching. That's $25K wasted for every $100K of salary, moving information around instead of doing real work.
Sugarbug is a workflow intelligence platform that connects the tools you already use โ Linear, GitHub, Figma, Slack, Notion, calendars, email, and more โ into a single living knowledge graph. Every signal is ingested, classified, and linked automatically. Tasks, people, and the relationships between them are mapped across every source.
The longer Sugarbug runs, the smarter it gets. It builds living profiles of the people you work with from every interaction, so you always have context on who's involved in what. Meeting briefs, status updates, and cross-tool summaries are generated from real data โ ready before you need them, without hunting across nine tabs.
The system is adaptive: it learns which sources matter most and adjusts how aggressively it monitors them based on actual activity patterns.
Sugarbug uses a provider-agnostic AI architecture โ bring your own LLM. Pick the model that fits your needs, swap it whenever you like. No vendor lock-in.
Built for product managers, design leads, and founders who spend their days stitching together updates from half a dozen apps before they can actually do their job.
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Mailwarm's answer
Mailwarm is an email warmup and deliverability platform built by a Y Combinator and Station F startup.
Since 2020, weโve worked with many types of companies: SaaS startups, recruitment agencies, e-commerce brands, and sales teams; to help them improve inbox placement safely.
Mailwarm is unique because it offers: - Real multi-provider warmup (Gmail, Outlook, Microsoft 365, Yahoo)
Clear and real spam score tracking
Built-in bounce prevention
Easy setup and stable automation
Our focus is simple: help businesses keep emails out of spam and land in the inbox.
Sugarbug's answer:
Most tools in this space are another dashboard to check. Sugarbug isn't a destination โ it connects the tools you already use and builds a knowledge graph across all of them. It doesn't replace Linear or Notion or Slack. It makes them work together by linking every signal, every person, and every task into a single picture. And that picture compounds โ the longer it runs, the less work you do to stay informed.
Mailwarm's answer
Mailwarm delivers real, measurable results instead of risky shortcuts.
Users choose Mailwarm because it provides: - Automated email warmup that protects sender reputation
Multi-provider engagement for realistic signals
Spam score to track deliverability progress
One-click Outlook and Office365 connection
Reliable campaigns with auto-recovery
Itโs an easy, transparent, and professional way to improve email deliverability.
Sugarbug's answer:
Competitors tend to solve one piece of the problem โ a better notification layer, a smarter calendar, an AI summariser. Sugarbug solves the structural problem underneath: your information is fragmented across tools that don't share context. Instead of adding another app, Sugarbug sits behind the ones you have and does the stitching for you. Meeting briefs, status updates, people context โ all built from real data across every source, not from a single silo.
Mailwarm's answer
Mailwarm is for anyone who depends on email outreach:
Sales teams sending cold emails
Founders and startups launching new domains
Marketing agencies
Recruiters and staffing firms
Growth and outbound teams
If inbox placement matters to your business, Mailwarm is built for you.
Sugarbug's answer:
Product managers, design leads, and founders who run on more tools than they can keep in their head. People who spend a quarter of their week moving information between apps instead of doing the work the information is about. If your day involves checking Linear, then Slack, then Figma, then Notion, then your calendar just to prepare for one meeting โ Sugarbug is built for you.
Mailwarm's answer
Mailwarm started as a real problem we faced ourselves.
We were two founders working at Station F in Paris, the largest startup incubator in Europe, trying to sell our own products. Every time we launched outreach campaigns, our emails kept landing in spam.
To solve this, we built an internal email warmup system for our personal use. After deep research into email deliverability, we created a stronger, more reliable solution.
Other startups in the incubator quickly asked to use it too; so we turned it into a real product.
After launching publicly, Mailwarm became #1 Product of the Day on ProductHunt and was accepted into Y Combinator, the worldโs most prestigious startup accelerator.
Since then, Mailwarm has grown into a trusted platform used by thousands of companies to improve inbox placement and email deliverability.
Sugarbug's answer:
Two people โ a Head of Design and a Head of Product โ were drowning in the same problem: too many tools, too much context switching, too little time for the actual work. Every existing solution was either another app to check or an AI wrapper around a single tool. So they built Sugarbug as a shared brain โ one system that watches everything, understands the connections, and does the legwork so they can focus on what matters.
Mailwarm's answer
Mailwarm is a secure cloud-based SaaS platform built on:
SMTP and IMAP email protocols
Advanced verification systems
Multi-provider infrastructure
Real-time analytics and monitoring
Reliable automation engines
These technologies ensure stable, continuous email warmup.
Sugarbug's answer:
Native app across macOS, Windows, Linux, iOS, Android, and browser. The AI layer is fully provider-agnostic โ bring your own LLM, no vendor lock-in. All integrations connect via official APIs over secure private networking. No Electron.
Mailwarm's answer
As a Y Combinator and Station F startup, Mailwarm works with:
Tech startups and SaaS companies
Recruitment and staffing agencies
Real Estate Agencies
B2B marketing agencies
E-commerce brands
Sales and outbound teams
Freelancers and consultants
From France to global markets, hundreds of organizations trust Mailwarm to improve email deliverability and inbox placement.
I decided to try Mailwarm after having consistent issues with my emails landing in spam folders. At the beginning, I wasnโt fully sure what to expect, but the onboarding process was simple enough to get me started quickly. After running it for a while, I began to notice a steady improvement in my email deliverability. More of my messages started reaching the inbox instead of getting filtered out, which really helped with my outreach efforts. Overall, itโs been a reliable experience. It may not be perfect, but it definitely does what itโs supposed to do if you give it time.
I started using Mailwarm because I was struggling with my emails going straight to spam, especially for outreach. At first, I wasnโt expecting much, but after a couple of weeks, I actually started noticing a difference. The setup was pretty simple, and once everything was connected, it just kept running in the background without me needing to constantly check it. Thatโs something I really appreciated.
Overall, Iโd say itโs a reliable tool if youโre serious about improving email deliverability without overcomplicating the process.
I have been using Mailwarm to warm up email accounts and improve overall deliverability for my outreach campaigns. The setup process was very simple and everything runs automatically without requiring constant monitoring. Since using the tool, Iโve seen a clear improvement in inbox placement and fewer emails landing in spam. Itโs a reliable and effective solution for anyone doing cold email or managing multiple inboxes.
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