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Howto sendmail on FC6

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-a, make sure DNS works fine first
-b, GUI install sendmail (m4, sendmail-cf and sendmail)
-c, service sendmail restart
-d, make sendmail to listen NICs
Edit /etc/mail/sendmail.mc To Make Sendmail Listen On NICs Too

To correct this you'll have to comment out the daemon_options line in the /etc/mail/sendmail.mc file with "dnl" statements. It is also good practice to take precautions against SPAM by not accepting mail from domains that don't exist by commenting out the "accept_unresolvable_domains" feature too. See the italicized lines in the example below.



dnl This changes sendmail to only listen on the loopback device 127.0.0.1
dnl and not on any other network devices. Comment this out if you want
dnl to accept email over the network.
dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
dnl NOTE: binding both IPv4 and IPv6 daemon to the same port requires
dnl a kernel patch
dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')
dnl We strongly recommend to comment this one out if you want to protect
dnl yourself from spam. However, the laptop and users on computers that do
dnl not have 24x7 DNS do need this.
dnl FEATURE(`accept_unresolvable_domains')dnl
dnl FEATURE(`relay_based_on_MX')dnl



-e, Regenerate The sendmail.cf File
[root@bigboy tmp]# m4 /etc/mail/sendmail.mc > /etc/sendmail.cf.



-f, support SMTPs on sendmail: EASY!!!
for FC6, 1,#cd /etc/pki/tls/certs
2, make sendmail.pem
3, Carefully edit the corresponding lines in /etc/mail/sendmail.mc to match the following:

define(`confAUTH_OPTIONS', `A p y')dnl
TRUST_AUTH_MECH(`LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `LOGIN PLAIN')dnl
define(`confCACERT_PATH',`/usr/share/ssl/certs')
define(`confCACERT',`/usr/share/ssl/certs/ca-bundle.crt')
define(`confSERVER_CERT',`/usr/share/ssl/certs/sendmail.pem')
define(`confSERVER_KEY',`/usr/share/ssl/certs/sendmail.pem')

4, regenerate the config file and restart the service
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