Cerb brings order to a busy team inbox with bot powered email management and workflow automation. Used by thousands of teams for 15+ years. For production, use: https://github.com/cerb/cerb-release/
We use cerb.ai - definitely has a learning curve and takes some configuration to get it up and running, but after that it works really well and the developers are very responsive (as well as good about keeping it up-to-date). Not as big a name as others, but I recommend because of the flexibility and versatility.
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