Using linuxconf-1.16r1.3-1, in the sendmail config, if I enable "special
routing db." with the "local delivery agent" set to "Let linuxconf probe"
Linuxconf will display the following cryptic message when I attempt to
accept my changes:
  "The value must be taken from the list"

If I choose another entry from the list (procmail, mail.local, or deliver)
it will be able to continue and generate sendmail.cf.