[Dovecot] A message, when moved by multiple clients with same account and same filters, can be duplicated by filters on destination imap folder.

I'm still collecting user feedback after moving from uw-imap to dovecot development release 1.1.rc3.

What said in the subject seems the obvious result of an improper configuration. Office emails are configured and accessed on multiple clients with the same automatic filters, and sometimes the filtered emails get duplicated on the destination folder.

The fact is that this was perfectly working with wu-imap (without any duplication/triplication of emails).

I'm looking if there is some workaround to keep this client misuse working with dovecot.

Could an email have a sort of "primary key" that forbids it's duplication in the same imap folder?

Regards, Diego.