The standard sendmail installed with most distributions should work just fine. Later in this document we will create a new sendmail.mc and generate a new sendmail.cf but the installation of sendmail is pretty straightforward. If you choose to download and compile sendmail you can choose the default configuration and install options. If you are installing from RPM please make sure you have both the sendmail and sendmail-cf packages installed. The current RPMs as of time of writing are sendmail-8.9.3-15.i386.rpm and sendmail-cf-8.9.3-15.i386.rpm.