Sendmail compiled with tcpwrappers yet ignores /etc/hosts.deny ?

[jon <jon@jonshouse.co.uk>]

root@mail:/usr/share/doc# ldd /usr/sbin/sendmail |grep 'libwrap'
        libwrap.so.0 => /lib/i386-linux-gnu/libwrap.so.0 (0xb7525000)
root@mail:/usr/share/doc# cat /etc/debian_version 
8.2

I want to use sendmail with tcp wrappers but it does not seem to play,
it looks like it was compiled with support,  can anyone help ?


Thanks,
Jon