Re-process emails from `/var/mail/root`

The mail forwarding was broken on one of my servers. Some emails accumulated in the local /var/mail/root mailbox instead of being forwarded. I fixed the forwarding now. Is there a way of reprocessing those emails so that they are re-sent?

I am asking that because when the email is forwarded to another server, the other server applies some filtering and processing to put the emails to appropriate folders accessible through IMAP.

Alteatively, would it be possible to convert the /var/mail/root mailbox file to a set of emails that could be copied directly to an IMAP folder (e.g. I could copy the file across to the other server manually).