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you should add in /etc/make.conf:
SENDMAIL_CF_DIR=	%%PREFIX%%/share/sendmail/cf

To deliver all local mail to your mailhub, edit the last line of submit.mc:
FEATURE(`msp','[mailhub.do.main]`)dnl

To update your configuration look at %%PREFIX%%/share/sendmail/cf/README.
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To use the ports versions you may add to your sendmail.mc file:

define(`confEBINDIR', `%%PREFIX%%/libexec')dnl
define(`UUCP_MAILER_PATH', `%%LOCALBASE%%/bin/uux')dnl

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To activate sendmail as your default mailer, call the target 'mailer.conf':
$ cd %%PORTSDIR%%/mail/sendmail && make mailer.conf

Your '/etc/mail/mailer.conf' should look like this:
#
# Execute the "real" sendmail program, named /usr/libexec/sendmail/sendmail
#
sendmail	%%PREFIX%%/sbin/sendmail
send-mail	%%PREFIX%%/sbin/sendmail
mailq		%%PREFIX%%/sbin/sendmail
newaliases	%%PREFIX%%/sbin/sendmail
hoststat	%%PREFIX%%/sbin/sendmail
purgestat	%%PREFIX%%/sbin/sendmail

You may also need to update /etc/rc.conf.
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