resend undelivered mail

After a mail server problem,

I have many undelivered mail in the Coldfsuion Mail "undelivr" directory.

The Mail server is up again

Is there a possibility to resend all these mails ?

I tried a copy/paste of mails into the "spool" directory

but these mail are resent into the "undelivr" directory

and new mails are sent correctly.

Thanks for help.

Pierre.