I’m using SpamSieve with MailMate on macOS Monterey and I’ve set the preference to keep the SpamSieve dock icon hidden.
To open SpamSieve, I installed the “Open Window” script in MailMate’s scripts folder so that I can open SpamSieve while I’m using MailMate. The script shows the dialog which tells to select the window to show, but it only works for the Statistics window. Nothing happens when I select any of the other options.