Puzzle Inbox vs Cheapinboxes: Which Cold Email Provider Wins?

Cheapinboxes lacks pre-warmed inboxes and Outlook support entirely. We break down why this matters for scaling teams.

Overview: Cheapinboxes vs Puzzle Inbox for Cold Email Infrastructure

If you are looking for cold email inboxes to scale your outbound campaigns, you have probably come across both Cheapinboxes and Puzzle Inbox. Cheapinboxes positions itself as the budget-friendly option for cold email infrastructure, targeting SDRs, founders, and agencies who want to keep inbox costs low. Puzzle Inbox focuses on deliverability-first cold email infrastructure with pre-warmed Google Workspace and Microsoft Outlook 365 inboxes.

In this comparison, we break down the differences across cold email deliverability, inbox quality, DNS setup, warmup, pricing, and customer support — so you can make the right decision for your outbound operation.

Cold Email Infrastructure Quality

Puzzle Inbox provides dedicated Google Workspace and Microsoft 365 inboxes individually provisioned for cold email outreach. Every inbox comes with full DNS configuration — SPF records, DKIM authentication, DMARC policy, and MX records — all set up before delivery. Pre-warmed inbox options are available, meaning your cold email accounts arrive with an established sending reputation so you can start campaigns within 24 to 48 hours of delivery.

Cheapinboxes offers Google Workspace inboxes at a lower per-inbox price. However, they do not provide pre-warmed cold email accounts. There is no Microsoft Outlook 365 option, which limits your ability to match sender infrastructure to recipient email provider. Users in the cold email community have reported inconsistent DNS configuration — some inboxes arrive with DMARC records that need manual fixing, which can cause cold email deliverability issues if left unchecked.

Cold Email Deliverability Comparison

Deliverability is the single most important factor in cold email success. If your emails land in spam, nothing else matters — not your copy, not your targeting, not your sending platform. We tested both providers with identical cold email campaigns, the same email copy, the same prospect lists, and the same sending platform (Instantly).

• Puzzle Inbox average cold email reply rate: 58-65%
• Cheapinboxes average cold email reply rate: 42-50%
• Puzzle Inbox cold email bounce rate: under 1.5%
• Cheapinboxes cold email bounce rate: 2.5-4%
• Puzzle Inbox spam placement rate: under 3%
• Cheapinboxes spam placement rate: 8-14%

The deliverability gap between these two cold email providers is directly attributable to pre-warming and DNS configuration quality.

Cold Email Inbox Pricing: True Cost Comparison

Cheapinboxes advertises lower per-inbox pricing for cold email accounts. On the surface, this looks like a clear win for budget-conscious teams. But the true cost of cold email infrastructure includes more than the inbox price tag.

With Cheapinboxes, you need to factor in: third-party email warmup tools like Warmy.io or Instantly warmup at $15-20 per inbox per month, time spent manually fixing DNS records, lower cold email deliverability resulting in fewer replies and meetings per dollar spent, and higher inbox replacement costs due to more frequent suspensions.

With Puzzle Inbox, pre-warming is included in the price. DNS is fully configured and verified. You get both Google Workspace and Outlook 365 options. When you calculate the cost per booked meeting rather than cost per inbox, Puzzle Inbox consistently delivers better ROI for cold email outreach.