Hi,
I know this is an old topic, but I ran into the same problem and couldn’t find any solutions in the API documentation. I am aware that it is possible to solve it by using the sieve options over IMAP, but since the API is for managing mailboxes, I thought there might be another solution available.
Does anyone have an update or hint on this topic?
@stollz #p4553, did you manage to solve this problem?