Cheapinboxes Pricing Guide 2026: Cheapest Cold Email Infrastructure

By Puzzle Inbox Team · May 10, 2026 · 5 min read

Cheapinboxes offers cheapest per-inbox rates. Here is the complete pricing breakdown including hidden costs that change the value equation.

Cheapinboxes Pricing Overview

Cheapinboxes targets the absolute bottom of cold email infrastructure pricing. Per-inbox rates starting at $1.50 appear unbeatable. The reality changes significantly once warmup, replacement churn, and deliverability differences are factored in.

Cheapinboxes Per-Inbox Rates

• Standard: $1.50-3/inbox/month
• Bulk discounts for 50+ inbox orders

True Total Cost

30 Cheapinboxes inboxes for 6 months all-in:

• Per-inbox: 30 × $2.50 × 6 = $450
• Warmup tool (required): 30 × $20 × 6 = $3,600
• Replacement churn: 30 × 0.10 × 6 × $2.50 = $45
• DNS verification labor: 6 hours × $50 = $300
• Total: $4,395

Puzzle Inbox pre-warmed comparable: $540-810 for same 6 months.

The Deliverability Penalty

Cheapinboxes shared infrastructure produces 40-50% lower reply rates than pre-warmed alternatives. For 30 inboxes over 6 months:

• Cheapinboxes estimated meetings: 30-45
• Puzzle Inbox estimated meetings: 80-120
• Meeting gap: 50-75 lost meetings at $1,500 each = $75K-112K lost pipeline

When Cheapinboxes Pricing Works

• One-time cold email testing (single month)
• Very low-volume operations (1-5 inboxes, < 100 emails/day)
• Teams accepting 40-50% lower deliverability