DKIM increases your chances of getting mail into an inbox. There's no "negative signal", that is, a recipient has no way of knowing emails were meant to be sign

DKIM increases your chances of getting mail into an inbox. There's no "negative signal", that is, a recipient has no way of knowing emails were meant to be signed and weren't. I know you can provide indications with DMARC, but the usual thing is that if an email is SPF verified then it's considered legitimate even when not signed. Accordingly, DKIM can help land emails but only helps security in the unusual situation where you're trying to argue something in an inbox definitely came from you.