Change into the src directory and execute
sendmail should build without any problems.
Henceforth I'm going to assume that you just use TCP/IP electronic
mail. UUCP support is beyond the scope of this document.
Change into the cf/cf directory and create a new file, generic-linux2.mc:
VERSIONID(`@(#)generic-linux2.mc 8.8 (Local) 11/22/97')
If you want to use masquerading, add the following two lines:
This means that all the e-mail that gets sent from your machine
(except e-mail from root) will appear to have originated from the
hostname that you specify. (This option is useful for people with
intermittent network connections, i.e. users of SLIP and PPP, and for
machines that have dynamically assigned IP addresses via BOOTP or
DHCP). For sendmail versions 8.8.8 and newer, omit EXPOSED_USER(root)
as it has become the default behavior.
If you want to use procmail as your local mailer (standard practice
with Red Hat Linux), add:
Transform "generic-linux2.mc" into a sendmail.cf file:
m4 ../m4/cf.m4 generic-linux2.mc > obj/sendmail.cf
You might need to comment out
in obj/sendmail.cf with a # sign as it appears to disrupt incoming e-mail on
newer Linux distributions.
Back up your old /etc/sendmail.cf file and install obj/sendmail.cf:
install -m 644 -o 0 -g 0 obj/sendmail.cf /etc/sendmail.cf
After you've installed your new sendmail.cf, kill the sendmail
daemon, change back into the src directory, and execute:
cd obj.Linux.*.* ; make install
This will install the sendmail binary and symbolic links. You'll need to
install the manual pages by hand.
If you haven't opted to use procmail, change into the main sendmail
directory and type:
mv mail.local mail.local.old
tar zxvf mail.local.linux.tar.Z
gcc -O3 -o mail.local mail.local.c
install -m 2711 -o 0 -g mail mail.local /bin
install -m 644 -o 0 -g 0 mail.local.8 /usr/man/man8
Your /var/spool/mail directory needs to be mode 775, owned by user root and
group mail. Your mail clients need to be SGID mail (mode 2711 and owned by
user root and group mail).
Now you should be ready to restart your sendmail daemon. Mine is
started like this:
/usr/sbin/sendmail -bd -q1h
NOTE: Red Hat starts sendmail without its full path name. This can lead to
problems such as preventing you from being able to HUP sendmail to cause it
to reread its configuration file. To fix this, make sure /etc/rc.d/init.d/
sendmail.init starts sendmail as /usr/sbin/sendmail (with the same arguments).
If you have an intermittent connection, you might want to start sendmail in
/usr/sbin/sendmail -bd -o DeliveryMode=d
on boot and invoke sendmail as:
to deliver all deferred e-mail when you first connect to the network and
periodically while you are connected (perhaps as a cron job).
At this point, you should test your new sendmail installation.
Here's one way to do this:
% telnet localhost smtp
Connected to localhost.
Escape character is '^]'.
220 ESMTP Sendmail 8.8.8/8.8.8; Fri, 22 Nov 1997 03:21:18 -0500
250 Hello jgotts@localhost [127.0.0.1], pleased to meet you
mail from: jgotts
250 jgotts... Sender ok
rcpt to: jgotts
250 jgotts... Recipient ok
354 Enter mail, end with "." on a line by itself
This is a test.
250 DAA23297 Message accepted for delivery
Also be sure to test that your e-mail clients still work and that you can
still receive mail from the outside world.
(1) TCP wrapper support is broken in 8.8.8. For a patch see
While you're at it, you might as well also apply: