ipurge test mode? analysis by date

[Adam Tauno Williams]

Version: cyrus-imapd-2.2.12-27.6

Does ipurge have a 'test mode' whereby I can run it and have it report
what it would have done?   

Management wants to know the impact on storage & message count of
purging all sent-mail older than one year and some other patterns.

Besides ipurge is there a way to query the server for all messages (or
count/size), across all user mailboxes, that match a given pattern?

something like:
sudo -u cyrus /usr/lib/cyrus/bin/ipurge -d 365 -f "user.%.sent-mail"
  - but without deleting anything.
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