buildd-mail(1) says:

DESCRIPTION
       buildd-mail processes incoming mail for the buildd user.

       buildd-mail-wrapper was a setuid wrapper for buildd-mail, which
       has  been  removed and is no longer required.  It has been kept
       as a symbolic link to buildd-mail for  compatibility  purposes,
       but is obsolete and will removed in a future release.

SETUP
       The  buildd user should have a file ~/.forward with the follow‐
       ing contents:

       |/usr/bin/buildd-mail-wrapper

       This will ensure all incoming  mail  will  be  processed  using
       buildd-mail.

This is inconsistent.  If buildd-mail-wrapper is obsolete, it shouldn't
be recommended in the SETUP section.

Thanks,