18.10. Running sendmail

The sendmail daemon can be run in either of two ways. One way is to have to have it run from the inetd daemon; the alternative, and more commonly used method is to run sendmail as a standalone daemon. It is also common for mailer programs to invoke sendmail as a user command to accept locally generated mail for delivery.

When running sendmail in standalone mode, place the command in an rc file so it starts at boot time. The syntax used is commonly:
/usr/sbin/sendmail -bd -q10m
The -bd argument tells sendmail to run as a daemon. It will fork and run in the background. The -q10m argument tells sendmail to check its queue every ten minutes. You may choose to use a different queue to check time.

To run sendmail from the inetd network daemon, you'd use an entry like:
smtp stream tcp nowait nobody /usr/sbin/sendmail -bs
The -bs argument here tells sendmail to use the SMTP protocol on stdin/stdout, which is required for use with inetd.

The runq command is usually a symlink to the sendmail binary and is a more convenient form of:
# sendmail -q

When sendmail is invoked this way, it processes any mail waiting in the queue to be transmitted. When running sendmail from inetd you must also create a cron job that runs the runq command periodically to ensure that the mail spool is serviced periodically.

A suitable cron table entry would be similar to:
# Run the mail spool every fifteen minutes 0,15,30,45 doc-index.html f3.html i19694.html index.html lag2_0101.jpg lag2_0201.jpg lag2_0202.jpg lag2_0301.jpg lag2_0501.jpg lag2_0601.jpg lag2_0801.jpg lag2_0901.jpg lag2_0902.jpg lag2_0903.jpg lag2_0904.jpg lag2_0905.jpg lag2_0906.jpg lag2_0907.jpg lag2_0908.jpg lag2_0909.jpg lag2_1101.jpg lag2_1501.jpg lag2_1601.jpg lag2_2001.jpg lag2_2101.jpg lag2_2301.jpg lag2_aa01.jpg lag2_aa02.jpg lag2_ab01.jpg lag2_ab02.jpg x-082-2-firewall.attacks.html x-087-2-accounting.flushing.rules.html x-087-2-accounting.html x-087-2-accounting.ipfwadm.html x-087-2-accounting.kernel.config.html x-087-2-accounting.passive.collection.html x-087-2-accounting.viewing.results.html x-087-2-accounting.zeroing.counter.html x-087-2-appendix.brewery.html x-087-2-appendix.cables.html x-087-2-appendix.gpl.html x-087-2-appl.html x-087-2-appl.inetd.html x-087-2-appl.remote.html x-087-2-appl.rpc.html x-087-2-appl.services.html x-087-2-appl.tcpd.html x-087-2-cable.plip.html 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x-087-2-issues.html x-087-2-issues.icmp.html x-087-2-issues.interfaces.html x-087-2-issues.ip-addresses.html x-087-2-issues.resolving.html x-087-2-issues.routing.html x-087-2-mail.address.html x-087-2-mail.delivery.html x-087-2-mail.elm.html x-087-2-mail.html x-087-2-mail.message-format.html x-087-2-mail.routing.html x-087-2-masq.configuration.html x-087-2-masq.kernel.config.html x-087-2-masq.namelookups.html x-087-2-masq.side.effects.html x-087-2-news.algorithm.html x-087-2-news.history.html x-087-2-news.html x-087-2-newsreaders.html x-087-2-newsreaders.nn.html x-087-2-newsreaders.tin.html x-087-2-newsreaders.trn.html x-087-2-news.usenet.html x-087-2-nfs.daemons.html x-087-2-nfs.exports.html x-087-2-nfs.html x-087-2-nfs.kernelv2.html x-087-2-nfs.kernelv3.html x-087-2-nfs.mountd.html x-087-2-nfs.nfsd.html x-087-2-nis.clients.html x-087-2-nis.html x-087-2-nis.nisplus.html x-087-2-nis.nsswitch.html x-087-2-nis.passwd.html x-087-2-nis.securenets.html x-087-2-nis.server.html 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In most installations sendmail processes the queue every 15 minutes as shown in our crontab example, attempting to transmit any messages there.