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Re:Gmailctl – Declarative Configuration for Gmail Filters by mikelward on Sunday March 29, 2020 @10:37AM (#22719329)
Fastmail already supports Sieve, so I'm not sure you'd need something like this.

https://www.fastmail.com/help/technical/sieve-howto.html

Re:Gmailctl – Declarative Configuration for Gmail Filters by toomuchtodo on Sunday March 29, 2020 @10:41AM (#22719358)
TIL! Thank you kind stranger.