Notes About sendmail

On HP XC systems, inbound mail from external connections is blocked by default at the firewall and is blocked by the DaemonPortOptions option of the sendmail.cf file. If you intend to receive mail from outside the HP XC system, you must modify these items.

When making modifications to sendmail, HP recommends that you do not modify the .cf files directly. Rather, modify the .mc files and run them through an M4 processor to create the .cf files. The M4 processing tools are part of the sendmail-cf RPM, which is not installed by default. This RPM is available on the HP XC distribution DVD in the extra RPMs directory.