Sendmail

This networking enhancement is new in the Developer 5/07 release.

There are some minor new options to sendmail(1M) and some new configuration macros described in /etc/mail/cf/README. The chief of these macros are the following three new FEATURE() macros, all of which are helpful in blocking unwanted spam:

• badmx

• require_rdns

• block_bad_helo

For information about sendmail, see the sendmail(1M) man page.