Cold-email products often look similar in a feature grid. The important differences appear in the usage model: how inboxes are connected, how send volume is distributed, what counts against a credit, and how the team handles replies and risk.
Count mailboxes, domains, and workspaces separately
A plan described as unlimited may still cap active prospects, uploaded contacts, monthly sends, team members, or client workspaces. Record each limit separately and model the stack at your expected operating volume.
Inspect deliverability controls, not the word deliverability
Look for sender-level throttles, provider-aware scheduling, automatic pause rules, bounce and complaint visibility, suppression lists, custom tracking domains, and an exportable record of what was sent from each inbox.
- Per-inbox daily limits
- Automatic bounce protection
- Global and campaign suppression
- Provider and domain health visibility
- Custom tracking controls
Test the reply workflow with real edge cases
Forward a reply, move ownership, receive an out-of-office response, get a reply from another address, and test whether every future step stops. Unified inbox claims are only useful if threading, classification, and team assignment survive those cases.
Separate sending, data, and verification costs
Some products bundle a lead database or verification credits; others assume separate providers. Bundling can simplify procurement, while a modular stack can make data quality and switching easier to control. Compare both models with the same target list and volume.