cron (auto.pl) 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/auto.pl

Error: Failed to open IMAP mailbox :

Error

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..

thanks.. -thom