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Red Hat and Sendmail

Posted 12-28-2011 at 03:15 PM by kbscores

Everyone Loves Sendmail!

Apparently Red Hat ships with both Sendmail and Postfix and a utility called alternatives. The alternatives command is used to swap between Sendmail and Postfix, because only one MTA may run at any given time. (Which I doubt--I'm sure someone somewhere has both running on a single machine)


This is what I learned:

General Information About alternatives command:
Red Hat and Fedora ship with two MTA
o Sendmail
o Postfix
Only one MTA may run at a time

The alternatives command provides an easy way to switch between MTA(s)

The alternatives command is an executable with a generic name on file system used to access a particular service

This executable is really a symbolic link to another symbolic link in /etc/alternatives directory

The alternatives command merely swaps between symbolic links

How-to View MTA Currently In Use:
[root] # alternatives --display mta

How-to Select new MTA:
[root] # alternatives --config mta

How-to Setup Postfix:
[root] # alternatives --set mta

Red-Hat Sendmail GUI Options:
[root] # redhat-switch-mail
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