Multiple messages with the same GUID

I somehow ended up with multiple messages in the same mailbox with the same GUID. All of the messages are identical (AFAICT) but getting multiple responses for doveadm fetch for a particular guid is screwing up one of my applications. When I searched for the offending guid in dovecot-uidlist I

action based on IMAP ID fields

Hello, is it possible based on the information we get from the IMAP ID fields sent by a client to start some actions e.g. reject an IMAP client with a certain OS version? -- Kind Regards Jörg Backschues