There seems to be a problem with using switches in the db_mail_path field in Setup > Email Options

I want to use /usr/sbin/sendmail -t -i but it looks like the mailer module doesn't support it:

GT::Mail (4088): Wrong argument passed to this subroutine. Usage: $obj->send (%opts); smtp or sendmail and a head part must exist at this point. at /home/sites/site12/web/perl/admin/Links/User/Login.pm line 192.