9.5. Sendmail -o

The -o command line option can be used to specify an option that would normally be set with an " O" line in the sendmail.cf file, or to override some option that actually is specified with an " 0" line in whatever configuration file you are using. All of the options described for the " 0" line in configuration files are available with the -o command line option. The most common use of the option during debugging is to specify a queue directory other than the standard one (e.g., -oQ/usr/spool/testq) so that your test messages don't pollute the main mail queue. You might also set the delivery option to "queued" ( -odq) to force Sendmail to drop the message in your alternate queue and abandon it there so you can examine it at your leisure.