Hybrid & Custom Infrastructure
For "admirals" who build their own fleet. This section covers "hybrid" setups where a company might use its own MTAs (like PowerMTA) for sending but integrate with a cloud ESP for content and analytics. This is the expert-level, high-control setup.
Questions about Hybrid & Custom Infrastructure
What is hybrid sending (ESP + custom MTA)?
Why do some companies build their own mail servers?
What are the benefits and risks of self-hosting email infrastructure?
What’s the difference between Postfix, Exim, and PowerMTA?
What is a “deliverability cluster”?
How to integrate custom routing with ESP tracking?
How do hybrid setups handle authentication?
How do internal relay chains affect traceability?
What’s the advantage of on-premise logs?
How to prevent custom servers from becoming open relays?
What is message queuing middleware (RabbitMQ, Kafka) in email pipelines?
When does hybrid make sense vs commercial ESP?