innmail - Simple mail-sending program

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 is a Perl script intended to provide the non-interactive mail-sending functionality of mail(1)
       while avoiding nasty security problems.  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.

       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 to  the  news  administrator,  as  well  as
       errors during the execution of a few programs.

innmail was written by James Brister <brister@vix.com> for InterNetNews.  This manual page was originally
       written by Jeffrey M. Vinocur.

       innmail - Simple mail-sending program

-aheader
           Specifies  an  additional  header  field  to add in the headers of the message.  It should be a well-
           formed header field surrounded by quotes, consisting of a name and a body separated with a colon  and
           a space.  For instance, "Auto-Submitted: auto-generated" is used by some programs invoking innmail.

           You  may  provide more than one header field if header is a multi-line string, which can for instance
           be done with these commands:

               HEADERS=$(echo -e "Hdr1: Body1\nHdr2: Body2")
               echo "test" | innmail -a "$HEADERS" -s Test joe

       -h  Gives usage information.

       -ssubject
           Sets the Subject header field body of the message.  A warning is issued if this option is omitted.

inn.conf(5), mail(1).

INN 2.7.3                                          2025-02-21                                         INNMAIL(1)

innmail [-h] [-aheader] [-ssubject] address [address ...]