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Cold email, in detail.

Fewer articles, written from what we actually run. For step-by-step guides and checklists, see the resources.

Mailbox Types

Best Cold Email Mailboxes for Agencies in 2026

Azure at €0.30 with the domain included, Google at €3.00 falling to €2.50. Which to run for which client, and what actually separates providers.

6 min read

Infrastructure

What Cold Email Infrastructure Actually Costs in 2026

The per-inbox price tells you almost nothing. Here is the arithmetic that matters, worked through at 500, 1,000 and 6,000 sends a day.

7 min read

Scaling

How Many Mailboxes Do You Need for Cold Email?

Divide target sends by the safe per-inbox limit. Azure is 2 to 3 a day, Google up to 15. Everything else follows from that.

5 min read