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Warmup Inbox vs Mails.ai

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Warmup Inbox compared with Mails.ai
DetailWarmup Inbox logo Warmup InboxMails.ai logo Mails.ai
What it doesEmail warmup service that improves deliverability and sender reputation Email infrastructure for AI agents
StageNot given Startup
FoundedNot given Not given
Based inSK Not given
Pricing modelFreemium Not given
PricingNot given Free: 3,000 emails + 3,000 inbound replies/month; Pro: $20/month for 50K emails + 50K inbound replies; Scale: $99/month for 250K emails + 500K inbound replies. Yearly billing available: Pro $200/year, Scale $990/year (two months free).
Key features
  • Sync inbox to network of 30,000+ real inboxes
  • Automated interactions: replies, marking as important, removing from spam
  • Email health monitoring and reports
  • Spam filter monitoring
  • Email reputation check
  • Outreach sequences
  • Custom warm up settings (Pro plan)
  • Scheduled warm up (Pro plan)
  • Per-agent email addresses on your domain
  • Native prompt-injection scanning on every inbound
  • Per-agent reputation graph
  • Typed reply events without raw MIME parsing
  • MCP-native distribution
  • Self-serve signup with no sales call
  • TypeScript and Python SDKs
  • HMAC-signed webhooks with retries
  • Per-agent allowlist and send limits
  • DKIM signing on custom domains
What makes it different
  • 30,000+ real inboxes used by real people in the network
  • One of the first companies to offer email warmup services
  • Simple and straightforward platform and pricing
  • Can help resurrect domains with poor reputation
  • No approval queue—sending works immediately on signup
  • Prompt-injection scanning built into every inbound message
  • Per-agent reputation tracking so each agent is scored independently
Community votes00
DR (Domain Rating by Ahrefs)62 +1 (up) since last check29 no change since last check
Trust Flow (Majestic)298
Citation Flow (Majestic)4636
Referring domains (Majestic)1824406

3 details filled in for both companies.

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