All mails to cracker.

Do the following steps as:

vi /etc/mail/virtusertable

@cracker.orgeric

service sendmail restart

/etc/mail/virtusertable file is used to send the mail coming for virtual user to real user. According to question, all mail to cracker.org should get by eric user so

@cracker.orgeric : Which sends all mail of cracker.org to eric user.