Best way to handle transactional + bulk emails in modern web apps?

Hey community,

We’re building a workflow-heavy web app with Builder.io and trying to improve email delivery performance for onboarding and notification flows.

For teams handling larger campaigns, how are you choosing a reliable Bulk email service provider without adding too much backend complexity?

Recently tested a few APIs, including DigitalAka™, mainly for deliverability and webhook support, and I’m curious what other developers here are integrating into their stacks.