Cron Mailing

Matthew Seaman m.seaman at
Thu May 13 04:16:02 PDT 2004

On Thu, May 13, 2004 at 12:51:34PM +0200, Ian Barnes wrote:
> Hi,
> I am trying to find out if something is possible. On our servers we would
> like all mail from cron not to come from root at boxname but rather from say
> ian at boxname.

I assume you still want the jobs to be run by root though, otherwise
you could just use the 'ian' account's crontab file.
> Is this possible? Am i making sense :P ??

Sure.  'root' always used to be special cased so that emails from
there don't go through address rewriting.  But since sendmail-8.10
that's no longer the case.  Just use the normal genericstable
mechanisms to rewrite the sender address. Read through the bits of
/usr/share/sendmail/cf/README that deal with genericstable first, but
essentially what you need is:

    i) Make sure your /etc/mail/`hostname`.mc file contains:

        FEATURE(genericstable, `hash -o /etc/mail/genericstable')dnl

       if not, add it to the .mc file and rebuild and
       restart sendmail in the usual way:

        # cd /etc/mail
        # vi `hostname`.mc
        # make all install restart-mta

   ii) Edit the /etc/mail/genericstable file to set up the e-mail
       address mappings you need.  That will be, minimally:

        root    ian

       and then process that into the .db hash format sendmail will

        # make

  iii) That's all you need to do.  Send some e-mails as root to test.

Nb. this rewrites all e-mail from root at, not just the stuff
emitted by cron. If you want to do that, it's going to be much harder
to achieve.

Dr Matthew J Seaman MA, D.Phil.                       26 The Paddocks
                                                      Savill Way
PGP:         Marlow
Tel: +44 1628 476614                                  Bucks., SL7 1TH UK
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