Dose Enhance Panel Support Mail Sieve?
EthickS Enhance uses it for the spam folder thresholds but there's no way of configuring it further through the UI at the moment. This will be possible in the future.
Have you searched?
Please see and upvote the existing feature request: https://community.enhance.com/d/190-autoreponder-in-a-webmail-cleint-sieve-logged