Mandrill is the old, 3rd party service that System Default (Google Chime) is replacing.
Itโs similar to how the new PDF engine is replacing PDF Rocket. But the new PDF service is an opt-in for beta testing, and this workflow option is a UI setting.
It should be a 1-to-1 replacement, but there are minor bugs still being worked out. I recently had to switch back to Mandrill because emails with hyphens are not getting delivered.
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