New to forum and SpamSieve (SS) - just installed and setup the app (v. 2.9.46) on my MBAir running Catalina and Apple Mail - want to remove the SS icon from the dock (and still keep active - assume needed to interact w/ Apple Mail). I read several related threads but most were 5-6+ years old - did I miss a recent one, if so sorry? How can this issue be handled at this time? Also, can the icon’s image be changed? Thanks. Dave 
The Dock icon can be hidden as described here, and it can be changed to an alternate image using the Use photo-realistic Dock icon preference.
Hi Michael - thanks for your prompt response - changed to an alternated image which I like better - seems like there are only two choices for the icon, correct? I’ll live with this other one for a while before trying to hide it. Much appreciated. Dave
Yes, there are only 2 icon choices.
Hi Michael - thanks again for your prompt help - thought there were just the two. Dave