Puzzle Inbox provides pre-warmed Google Workspace and Microsoft 365 inboxes for cold email outreach, with DNS configuration and OAuth setup completed before delivery. The company provisions fully operational mailboxes in 24-72 hours, backed by operational data from over 70,800 mailboxes deployed since 2023. Their infrastructure is optimized around specific sending caps—12 emails per inbox per day on Google Workspace and 3 on Microsoft 365—to minimize suspension risk.
Funding
Funding not disclosed
Founders
Product
Problem
Cold email senders face high suspension rates and poor deliverability when launching new inboxes without proper warm-up periods, which typically take 2-4 weeks. Setting up domains, DNS records, and OAuth authentication across multiple mailboxes is technically complex and time-consuming, while exceeding safe sending volumes per inbox or per domain significantly increases the risk of account bans.
Solution
Puzzle Inbox provides fully provisioned, pre-warmed Google Workspace and Microsoft 365 inboxes that are DNS-ready and delivered within 24-72 hours, eliminating the traditional warm-up waiting period. The company handles all technical setup including domain configuration, DNS records, and OAuth handoff, so outbound teams can start sending immediately. Their infrastructure is calibrated using anonymized telemetry from 70,800+ mailboxes operated since 2023, with recommended sending caps of 12 new conversations per inbox per day on Google Workspace and 3 per day on Microsoft 365 to maintain low suspension rates. The platform also offers a unified credit system covering leads, verifications, and email sends, plus an AI-powered unified inbox that categorizes replies by interest level and flags hot prospects.
Target Audience
Primary customers are cold email practitioners including founders, SDRs, freelancers, and agencies who need reliable, pre-warmed inbox infrastructure to launch outbound campaigns quickly without managing technical setup or risking suspension.
Features
- Pre-warmed Google Workspace and Microsoft 365 inboxes with OAuth setup and DNS configuration completed before delivery
- 24-72 hour provisioning timeline with staged delivery flow and QA gates for each tenant
- Per-inbox sending caps calibrated from cohort data: 12 emails/day on Google Workspace (1.9% suspension rate at 3 mailboxes per domain) and 3 emails/day on Microsoft 365 (up to 100 mailboxes per tenant)
- Unified credit balance covering leads, verifications, and email sends at $0.01 per credit, eliminating separate data and sending plans
- AI-powered unified inbox that categorizes replies by interest level, auto-tags responses, and flags hot prospects
- Triple verification process for contact records with on-demand refresh rather than cached data
- Tools directory cataloging 754+ cold email products with verified pricing and provider comparisons
- Editorial content library including 879 guides, compliance resources, and deliverability best practices