moving only new mails from one server to another

[Nicolas]

Hello,

I think it is not really the right place to post about that, but lot of 
dovecot experts there ;)

Basically, I have a server with dovecot 2.2.9 that has new (unread) 
mails  (because of a bad DNS config at a migration time).

Is there an easy way to move only these unread mails to a another server 
? (no perms trouble here : all vmail:vmail)

Though to iterate through all /var/vmail/*/*/Maildir/new and scp/rsync them.

Would that work ?

Thanks in advance for your time.

Nicolas