Ended up adding more checks, edits etc..

I'll post the most important ones: in stead of for my $msg ($mb->get_messages) use:

        for (0 .. $mb->nmsgs - 1) {
            my $msg = $mb->get_message($_);
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This because I missed messages with the 'for' loop!

Large mails ended in errors, I ended up editing the IMAPClient.pm, altering Maxappendstringlength to 1024**20 in stead of 1024**2

Also had some headaches with Character coding of foldernames.. IMAP doesn't support a lot..

If you'dd like the whole code I created, let me know..