This is the message I got:

# echo test | mail -v username@someplace.tld
Warning: .cf file is out of date: sendmail AIX5.3/8.13.4 supports version 10, .c
f file is version 9
WARNING: local host name (XXXXXXXXX) is not qualified; see cf/README: WHO
AM I?
/dead.letter... Saved message in /dead.letter