Creating mailbox file: File exists

# /usr/sbin/useradd -g oinstall -G dba,asmdba,oper oracle
Creating mailbox file: File exists
useradd: warning: the home directory already exists.
Not copying any file from skel directory into it.
# userdel -r oracle
userdel: /var/spool/mail/oracle not owned by oracle, not removing
# ll /var/spool/mail/oracle 
-rw-rw---- 1 54321 mail 0 Nov  4 16:42 /var/spool/mail/oracle
# rm /var/spool/mail/oracle 
rm: remove regular empty file `/var/spool/mail/oracle'? y
# userdel -r oracle
userdel: user oracle does not exist
# /usr/sbin/useradd -g oinstall -G dba,asmdba,oper oracle
# 
find / -name "*oracle*"