Tools and services in your infrastructure - don't build the boilerplate!
Building apps comes with lots of boilerplate and repetition. Outstack is a collection of tools to drop into your infrastructure to let you carry on building the interesting stuff.
Enveloper is the first tool, a transactional email microservice: https://medium.com/@adamquaile/introducing-enveloper-e6d606fbbb40
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It supports MJML and Twig, but fundamentally is customisable for any (and multiple) languages. Attachments, an API, good documentation!