When does hybrid make sense vs commercial ESP?

Choosing between hybrid infrastructure and pure ESP depends on your specific needs, resources, and constraints.

Pure ESP makes sense when:

You lack dedicated email engineering expertise

Volume doesn't justify infrastructure investment

ESP features (templates, automation, analytics) are important

You want managed deliverability and reputation

Time-to-value matters more than customization

Predictable per-message costs work for your model

Hybrid makes sense when:

Scale economics: Very high transactional volume where self-hosting is cheaper

Compliance requirements: Data residency, logging, or audit needs ESPs can't meet

Specialized needs: Unique routing, integration, or processing requirements

Risk distribution: Critical need to not depend on single vendor

Existing investment: Already have mail infrastructure and expertise

Questions to ask:

Do you have email expertise on staff or can hire it?

Is volume high enough to justify infrastructure cost?

Are there requirements ESPs genuinely can't meet?

Are you willing to manage reputation yourself?

What's the total cost comparison (include personnel, not just hosting)?

Most ships are better served by established shipping lines than owning their own fleet. But for the right circumstances, hybrid or self-hosted makes strategic sense.