Mailwarm is an email warmup service that automatically improves sender reputation for new or underperforming email domains by exchanging positive email interactions within its warmup network — building the engagement signals that inbox providers use to classify a domain as trusted.
Product Overview
Mailwarm connects to any Gmail or Outlook account via OAuth and immediately begins warmup activity: it sends emails to other accounts in its network, which automatically open, reply to, and remove those emails from spam — creating a pattern of positive engagement that gradually builds domain reputation. The service runs on autopilot without manual intervention, making it practical for teams managing multiple sending domains simultaneously. The platform's dashboard shows daily warmup activity, reputation score trajectory, and estimated inbox placement readiness. Mailwarm positions itself as a simple, reliable warmup tool without the complexity of all-in-one deliverability platforms — suitable for users who want warmup without additional features.
Key Features
- Automated Warmup: Sends and receives emails within the warmup network daily — builds positive engagement signals automatically.
- Reputation Score Tracking: Daily tracking of domain reputation score and warmup progress — shows trajectory toward inbox-ready status.
- Multi-Account Management: Manage multiple sending accounts simultaneously — useful for agencies and teams with multiple sending domains.
- Gmail & Outlook Support: OAuth connection to Google Workspace and Microsoft 365 — no SMTP configuration required.
- Inbox Placement Monitoring: Tracks inbox vs. spam placement during warmup period to verify improvement.
Best For
Sales teams and agencies warming up multiple sending domains who want a simple, automated warmup service without additional deliverability tool complexity.
Pricing
From $79/month per inbox. Volume discounts for multiple inboxes.
Key Integrations
Gmail, Google Workspace, Outlook, Microsoft 365, Lemlist, Instantly, Smartlead, Woodpecker, Reply.io, Mailshake
Pros
- Fully automated — no manual activity required during warmup
- Multi-account management suits agencies managing multiple client domains
- Simple OAuth setup — operational in minutes without SMTP configuration
- Dashboard provides clear progress visibility during warmup period
Cons
- Warmup-only tool — no content analysis, blacklist monitoring, or sending platform features
- Higher price per inbox than some competitors
- Warmup effectiveness varies by domain age, history, and inbox provider
RevOps Jobs-to-Be-Done
- Email Account Warm-Up — Warm up Gmail and Outlook accounts automatically using Mailwarm's network of real inboxes to build sender reputation for cold outreach. KPI: Build safe sending reputation for cold email accounts in 3–4 weeks vs months of manual warm-up
- Sender Reputation Maintenance — Maintain ongoing warm-up activity to prevent deliverability degradation during high-volume cold outreach periods. KPI: Maintain 85%+ inbox placement rates by keeping warm-up activity running alongside cold campaigns
- Deliverability Health Dashboard — Monitor your email account health score and warm-up progress in a simple dashboard with recommendations for improvement. KPI: Identify and address deliverability issues before they impact campaign performance with weekly health checks
How It Fits Your Stack
Primary system of record: Cold email platforms and Gmail/Outlook
Key integrations: Gmail, Outlook, G Suite, Microsoft 365
Data flows: Email account connected; automated warm-up interactions generated in the warm-up network; health score updated daily
Security & Compliance
- SSO / SAML: Google SSO
- RBAC / permissions: No
- Audit logs: Yes
- Certifications: GDPR compliant
- Data residency: EU
Implementation & Ownership
- Time to first value: Same day
- Implementation complexity: Very low — one-click email connection
- Typical owners: SDR, Account Executive, Growth Hacker
Simple focused warm-up tool; best for individual reps or small teams warming individual email accounts
Proof & Buyer Signals
Ratings: G2: 4.5/5 (80+ reviews)
What buyers praise:
- Simple and reliable warm-up
- Easy setup for non-technical users
- Good value for money
Common complaints:
- Smaller network than Instantly or Warmy.io
- Limited analytics depth
Often Compared With
- Lemwarm — Lemwarm has better UI and is native to the Lemlist ecosystem; Mailwarm is simpler and more standalone for basic warm-up needs
- Warmy.io — Warmy.io has a larger AI-driven warm-up network; Mailwarm is simpler and more affordable for basic individual account warm-up
- Instantly Warmup — Instantly combines warm-up with a full outbound sending platform; Mailwarm is a standalone warm-up tool for any existing email workflow
