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Sendmail on Solaris by default is configured to run in secure mode.Therefore, it only listens on the local loopback interface, ie, 127.0.0.1.
In order to enable it to listen on its network interface, the following command must be executed:
svccfg -s sendmail setprop config/local_only = false
which then enables sendmail to listen on the configured network interface listed in sendmail.cf under /etc/mail.
A method to design records so that they're allocated on a specific byte boundary, such as 16 bytes, 512 bytes, 4096 bytes, etc.