checking sendmail... configure: error: File /usr/sbin/sendmail is not an executable file but sendmail (from mail-mta/ssmtp) is in /usr/bin. Symlink is workaround: cd /usr/sbin && ln -s ../bin/sendmail
Hmmm, you are using one of those mailer-config compatible revisions, it seems...
I think so, mail-mta/ssmtp-2.61-r31.
Please try -r31 in a couple of hours. I just commited it. Thanks. - ferdy