Proton Sieve Filters
References: Proton Email Filters Proton Sieve Filters Why Sieve Filters? Rather than a long list of email filter rules that become unmanageable, Proton encourages the use of sieve filters - and limits users to 250 filters total. Sieve allows a user to combine what might by over a dozen filter rules down into one logical, legible, flexible flow. This little blog post is specific to Proton and how they do email filters with Sieve. This post is not all encompassing, RTFM. ...