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RedHat 9 (Linux i386) - man page for innmail (redhat section 1)

INNMAIL(1)						    InterNetNews Documentation							INNMAIL(1)

innmail - Simple mail-sending program
innmail [-h] [-s subject] address [address ...]
innmail is a Perl script intended to provide the non-interactive mail-sending functionality of mail(1) while avoiding nasty security prob- lems. It takes the body of a mail message on standard input and sends it to the specified addresses by invoking the value of mta in inn.conf. At least one address (formatted for the MTA specified in inn.conf if it matters) is required. innmail will sanitize the addresses so that they contain only alphanumerics and the symbols "@", ".", "-", "+", "_", and "%". innmail was written to be suitable for the mailcmd setting in inn.conf.
-h Gives usage information. -s subject Sets the Subject: header of the message. A warning is issued if this option is omitted.
This sends a one-line message to the local user "joe": echo "A one-line message." | innmail -s "Simple message" joe innmail by default is used by INN for sending nightly reports and control message reports.
innmail fails on addresses that begin with "-", although one might hope that the news server will not need to contact any such addresses. There are many "correct" addresses that will be silently modified by the sanitization process. A news administrator should be careful to use particularly sane addresses if they may be passed to innmail.
innmail was written by James Brister <> for InterNetNews. This manual page was originally written by Jeffrey M. Vinocur.
inn.conf(5), mail(1). 3rd Berkeley Distribution INN 2.3.2 INNMAIL(1)