Why Aerosend chose Warmup Inbox after testing 6+ warmup tools
Aerosend benchmarks warmup tools for the clients it helps send nearly 50 million cold emails. After testing more than six providers, it scaled on Warmup Inbox.
- Scaled from 2 test inboxes to a full rollout across 2025
- Integration-partner pricing for managing large inbox volumes
The challenge
Aerosend is an email service provider focused on deliverability, helping clients send nearly 50 million cold emails, with warmup offered as a key add-on. To give clients the best results, the team continuously benchmarks warmup services rather than settling on one.
How they used Warmup Inbox
Aerosend started testing Warmup Inbox in January 2025 with two inboxes and scaled the rollout through October 2025. Out of more than six providers tested, Warmup Inbox stood out for the lowest bounce rate in its warmup network, reply rates up to 65% on warmup emails, and a broad Google and Outlook network. The team is now testing language warmup for international deliverability.
Warmup Inbox is the service provider with the lowest bounce rate within its warmup network.
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