[Dovecot] Message filtering capability at IMAP proxy

Hi, I would like process the messages at Dovecot IMAP proxy. In one of the documents, it was mentioned that Dovecot proxy currently supports on the fly message filtering in latest releases. Will it it possible to extend the filtering feature to handle the following requirements.

1. Parse the email at IMAP proxy.
2. Replace the links with some other secure links.
3. Replace the attachments with some other document.

It would be great, if any one can provide some pointers to move forward.

• Thanks in advance CM Reddy