I know that sieve filters normally only apply to new incoming mail. What I’d like to know: is there a way to apply a sieve rule to messages that are already in a mailbox? I know Google and Zimbra have functionality like this. I don’t think mailcow/sogo supports this, but maybe there is a way to do it from the command line?
Is there a recommended or “safe” way to do this in Mailcow? Thanks in advance for any pointers!