Acquisition
Jun 2025mailX announced the acquisition of Mailwarm and framed it as the launch step for a broader email deliverability ecosystem.
SourcePrevents marketing emails from landing in spam.
Company research
Public company, workplace, funding, and market signals
Updated Jul 30, 2026
Overview
Mailwarm is an acquired email warmup and deliverability SaaS that helps teams improve sender reputation and inbox placement by generating real engagement signals across a large inbox network; it now appears as part of the broader mailX deliverability ecosystem. Public sources conflict on some historical facts, but company-linked sources consistently show a 2020 start and a seed-backed launch.
Primary product
Automated email warmup and deliverability platform
Founded
2020
Headquarters
Wilmington, Delaware, United States
Team size
1-10 employees
Industry
Software Development
Sub-industry
Email deliverability / email warmup SaaS
Offices
Wilmington, Delaware, United States
Paris, France
Casablanca, Morocco
Dubai, United Arab Emirates
Business model
subscription SaaS
usage-based add-ons
custom enterprise plans
deliverability audit / consultative services
Funding
Stage
Seed
Total raised
$125K
Latest round
Seed · Aug 2020
Latest amount
$125K
Aug 2020 · Y Combinator
People & investors
Leadership
Chief Executive Officer
Co-Founder & CTO
Chief Product Officer
Head of Deliverability
Founders
Co-founder
Investors
Work & culture
Lean, transparent, agile, and engineering-led; the team is distributed across Paris, Casablanca, and Dubai.
Benefits
expert deliverability guidance included in every plan
free deliverability audit
cancel anytime
custom enterprise plans
Product & market
Pricing
Subscription plans with per-interaction usage charges and custom enterprise pricing
Differentiators
- —uses a network of 50,000+ aged real inboxes
- —shows live inbox-vs-spam placement tracking
- —includes deliverability expert guidance in every plan
- —supports provider-level warmup controls across Gmail, Outlook, Yahoo, and SMTP
- —offers multi-inbox/team management
- —uses OAuth-based mailbox connections without password sharing
- —adds bounce prevention and inbox verification
Technology
OAuth
SMTP
Gmail
Outlook
Microsoft 365
Yahoo
Zoho
SendGrid
SPF
DKIM
DMARC
BIMI
Customers
founders
sales teams
agencies
businesses doing cold outreach
SaaS startups
recruitment and staffing agencies
real estate agencies
e-commerce brands
marketers
newsletter creators
freelancers
consultants
Competitors
Lemwarm
Warmbox
Warmup Inbox
MailReach
Instantly.ai
Reply.io
iContact
SendGrid
MessageGears
Validity
Scale & contact
Estimated revenue
Not publicly disclosed; a third-party profile reported $50K MRR within months of launch, implying an historical run-rate of roughly $600K ARR.
Estimated monthly visits
69.8K
Traffic estimate as of May 2025
Signals & risks
Latest news
Stork.AI · Jun 2026
Review coverage of Mailwarm 2.0 and its deliverability positioning, including the Product Hunt launch and the product’s warmup-and-monitoring approach.
Nubia Magazine · Jun 2026
Independent review covering pricing, feature set, strengths, and tradeoffs; useful for confirming 2026 plan structure and market positioning.
LinkedIn · Jun 2026
Mailwarm announced its Product Hunt relaunch and described Mailwarm 2.0 as an updated deliverability product focused on inbox placement and sender reputation.
GlobeNewswire / mailX · Jun 2025
Announced Mailwarm’s acquisition and positioned it as the foundation for mailX, a broader email deliverability ecosystem.
Y Combinator
YC launch page for mailX, describing diagnostics via web, API, and MCP and stating that Mailwarm helps build sender reputation through real inbox interactions.
Jobs and careers at Mailwarm
0 jobs at Mailwarm
No open positions
Check back later for new openings