cron ( sends out email after restore

hello there,

i recently had to restore one of my virtual servers to a backup from about a week ago… now all its users get the following email from a cron job about once an hour:

subject: Cron <USER@SERVER> /home/SERVER/homes/USER/.usermin/mailbox/

Error: Failed to open IMAP mailbox :

Failed to open IMAP mailbox :

were their accounts effected by the restore? i made sure i selected to restore the server’s home directory only…

anything i can do to make this stop? could this indicate any other damage i should look into? what’s the best way to proceed… any advice much appreciated…