Hello, in earlier versions of cyberpanel, snappymail did not come with “sieve” addon enabled by default for the “Snappymail” client.
I have now coded it to be enabled in V2.5.5-dev
But for now, it can be enabled manually.
It does, however, have bugs if you try to enable it manually.
Filtering Spam in RainLoop, AutoReply and Email Filters with Sieve - Blog Posts - CyberPanel Community