[Dovecot] Gettings mails recently moved to a folder

Hello,

some spam training tools learn the same message over and over again. Since I want to use a daily cronjob to train messages and I do not want to have the same messages trained multiple times, I need to way to get new messages in a folder.

Is there a (consolish) way to get a list of messages that were recently moved to a folder? dovecot does not modify mtime, according to RFC 3501.

Thanks, Florian