The redirections are processed by the Postfix local(8) delivery agent.
Normally, the aliases(5) table is specified as a text file that serves as input to the postalias(1) command.
For instructions on configuring Postfix as a server for other clients, see Section 18.104.22.168, “Basic Postfix Configuration”.
It is important to be aware of what Sendmail is and what it can do, as opposed to what it is not.
When the table is provided via other means such as NIS, LDAP or SQL, the same lookups are done as for ordinary indexed files.
Alternatively, the table can be provided as a regular-expression map where patterns are given as regular expressions.
This is available only on systems with support for Berkeley DB databases.
If required to switch the default MTA to Sendmail, you can either uninstall Postfix or use the following command as Configuring Postfix to accept network connections from hosts other than the local computer takes only a few minor changes in its configuration file.Unlike Sendmail, no macro processing is required for changes to take effect and the majority of the most commonly used options are described in the heavily commented files.file does not allow Postfix to accept network connections from a host other than the local computer.This article shares two interesting tricks that I discovered with Sendmail on AIX.Sendmail behaves a little differently on AIX compared to other UNIX® systems.