Sent isn'tthe same as delivered.

Usually, but slowly and by sending less before sending more: authentication fixed, the list cut back to demonstrably engaged recipients, volume rebuilt on a warmup curve, and the damaged stream separated from the healthy one.

Anyone promising a fast fix is describing a new domain, which inherits the same problem in a quarter if the underlying sending behaviour doesn't change.

Within the rules of the market you're sending to, and those rules differ sharply. B2B outreach with a legitimate-interest basis, clear identification, and honest opt-out is workable in much of Europe; several jurisdictions are stricter, and some list sources are never acceptable anywhere.

We'll build the infrastructure and tell you plainly where a plan crosses a line. Purchased lists are the fastest route to the reputation problem in the previous answer.

Seed panels for directional placement, postmaster and feedback-loop data where providers expose it, and engagement patterns by provider as the strongest indirect evidence. Reply and click behaviour holds up where open rates no longer do.

None of that is exact, and we present it as an estimate with its error bars rather than a placement percentage that implies precision nobody actually has.

We also built and run MailGenius, the spam test that grades a message before it goes out, so this is a measurement layer we operate rather than one we read about.

It depends on volume, whether your streams need genuine isolation, and how much control you want over the sending path. High-volume senders with mixed streams usually benefit from separating transactional and marketing at the infrastructure level, whoever the vendor is.

We're not resellers and take no vendor commission, so the recommendation is whichever one fits, including staying where you are.

We have built that layer ourselves. InboxPro sends on infrastructure we wrote from scratch: KumoMTA on owned bare metal, its own egress IP estate, multi-tenant routing, warmup, and ISP feedback loops.

Yes, with a staged cutover: new sending infrastructure warmed alongside the old, traffic moved by segment starting with your most engaged recipients, and reputation watched at each step with a rollback point.

The failure mode is a big-bang switch that moves full volume onto cold infrastructure overnight. With planning, that is entirely avoidable.

You do. Code, trained models, pipelines, and documentation are yours, along with the infrastructure access to run them without us.

We hand over a codebase your own team can pick up. Nothing we build is designed to keep you dependent on us.