Unfortunately Google doesn’t provide APIs for snooze or mute, so I imagine it would be a massive undertaking to try to build either feature with custom Mimestre

Unfortunately Google doesn’t provide APIs for snooze or mute, so I imagine it would be a massive undertaking to try to build either feature with custom Mimestream infrastructure. And even then it would be a non-native hack and not compatible with other clients. I filed feature requests for the missing APIs when I worked at Google (not on the Gmail team), but I never saw any sign up uptake unfortunately.