Cold email automation with unlimited mailboxes and automatic inbox rotation
Open-source cold email and warmup platform
Stage
Startup
Startup
Founded
2026
2024
Based in
Not given
GB
Pricing model
Freemium
Freemium
Pricing
Free: up to 10,000 sends per month with small footer. Monthly: $25/month (regular $45) with 7-day free trial. Yearly: $199/year (regular $399). All paid plans include unlimited sends, unlimited mailboxes, and unlimited team seats.
Not given
Key features
Unlimited mailboxes with automatic rotation
Automatic warm-up ramp
Daily and hourly sending caps
Merge tag personalization
Gmail and Outlook integration
MCP server for Claude and ChatGPT
Mailbox warmup with automatic reputation building
Campaign sequences with A/B testing
Unified inbox with reply classification
Deliverability tracking and inbox placement tests
Automation workflows with conditional logic
Per-mailbox safety caps and throttling
What makes it different
One flat price for unlimited mailboxes and team seats—no per-mailbox fees or per-user charges
Integrated warm-up ramp included in every plan
Bounce intelligence that automatically pauses bouncing inboxes
Manage campaigns from Claude or ChatGPT without leaving your chat
Fully open-source codebase under Apache 2.0, readable on GitHub
Self-hostable with one command or cloud-hosted options
Unlimited mailboxes on paid plans, no per-mailbox fees
Transparent health rules with full explanations for throttling
Built in public with public changelog and no inflated metrics
InboxJoy
Warmbly