[Dovecot] Mail being delivered to mbox instead of Maildir

I thought I had Dovecot configured to use Maildir instead of mbox, but apparently it is still using mbox.

Excerpt from dovecot.conf: mail_location = maildir:~/Maildir

Excerpt from sendmail.mc: MAILER(dovecot)dnl

dovecot.m4: ######################################## ### DOVECOT Mailer Specification ### ######################################## Mdovecot, P=/usr/local/libexec/dovecot/deliver, F=DFMPhnu9, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP/HdrFromSMTP, T=DNS/RFC822/X-Unix, A=deliver -d $u Thank you

Sean Smitz