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fedora
[root@lbox ~]# file /etc/postfix/transport*
/etc/postfix/transport: ASCII English text
/etc/postfix/transport.db: Berkeley DB (Hash, version 8, native
byte-order)


# python /usr/lib/python2.4/whichdb.py /etc/postfix/transport
UNKNOWN /etc/postfix/transport
# python /usr/lib/python2.4/whichdb.py /etc/postfix/transport.db
dbhash /etc/postfix/transport.db

ubuntu
/etc/postfix/transport: ASCII text
/etc/postfix/transport.db: Berkeley DB (Hash, version 8, native byte-order)

# python /usr/lib/python2.4/whichdb.py /etc/postfix/transport
dbm /etc/postfix/transport
# python /usr/lib/python2.4/whichdb.py /etc/postfix/transport.db
dbhash /etc/postfix/transport.db

why the difference? according to the whichdb code, It looks for the .db
form and should pick it up except it isn't.