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Full Discussion: Sendmail Fails to send emails from Linux server.
Top Forums Shell Programming and Scripting Sendmail Fails to send emails from Linux server. Post 303003048 by mohtashims on Thursday 7th of September 2017 06:53:45 AM
Old 09-07-2017
RedHat
Quote:
Originally Posted by drysdalk
Hi,

OK, thanks. Well, that certainly confirms that there is a discrepancy between the macro and the config. If Sendmail was actually having its config properly re-generated, that DS line would read something like DSsmtp.zoho.com, but instead it's blank. Do you have the sendmail-cf package installed ? If not, that might explain why it's not re-building properly. Does your m4 command return any errors when you run it ?

Also, could you provide the output of the following commands, please ? These are to check if Sendmail is hard-configured to masquerade for any particular domains.

Code:
grep -i masq /etc/mail/sendmail.mc
grep ^DM /etc/mail/sendmail.cf
grep ^C\{M /etc/mail/sendmail.cf

Hopefully we'll get to the bottom of this soon. The main thing is to check that you have sendmail-cf installed. If you don't have it installed, then install it, try re-building your config, and see if things start to work.
I do not know how to check if sendmail-cf is pre-installed or not.

I however, tried installing it anyways. See the Output below.

Code:
[root@development_techx ~]# yum install sendmail-cf
Loaded plugins: fastestmirror, replace
base                                                                                                                                                  | 3.6 kB  00:00:00
centos-sclo-rh                                                                                                                                        | 2.9 kB  00:00:00
centos-sclo-sclo                                                                                                                                      | 2.9 kB  00:00:00
cwp                                                                                                                                                   | 2.9 kB  00:00:00
epel/x86_64/metalink                                                                                                                                  |  12 kB  00:00:00
epel                                                                                                                                                  | 4.3 kB  00:00:00
extras                                                                                                                                                | 3.4 kB  00:00:00
mariadb                                                                                                                                               | 2.9 kB  00:00:00
remi-safe                                                                                                                                             | 2.9 kB  00:00:00
Not using downloaded repomd.xml because it is older than what we have:
  Current   : Wed Aug 30 17:35:30 2017
  Downloaded: Sat Aug 26 05:24:20 2017
updates                                                                                                                                               | 3.4 kB  00:00:00
webtatic                                                                                                                                              | 3.6 kB  00:00:00
(1/2): epel/x86_64/updateinfo                                                                                                                         | 817 kB  00:00:01
(2/2): epel/x86_64/primary_db                                                                                                                         | 4.8 MB  00:00:02
Loading mirror speeds from cached hostfile
 * base: mirrors.kernel.org
 * epel: mirror.sfo12.us.leaseweb.net
 * extras: mirrors.kernel.org
 * remi-safe: mirrors.thzhost.com
 * updates: mirrors.kernel.org
 * webtatic: sp.repo.webtatic.com
Package sendmail-cf-8.14.7-4.el7.noarch already installed and latest version
Nothing to do

After this i ran
Code:
m4 /etc/mail/sendmail.mc > /etc/mailsendmail.cf

There is no output generated but i did make sure the command did not error using echo $? returning 0

I then restarted the smtp service but mail still does not work.

Seems the cf is still not generated properly.

Code:
1.
grep ^DS /etc/mail/sendmail.cf
DS

2. 
grep -i masq /etc/mail/sendmail.mc

dnl MASQUERADE_AS(`mydomain.com')dnl
dnl # masquerade not just the headers, but the envelope as well
dnl FEATURE(masquerade_envelope)dnl
dnl # masquerade not just @mydomainalias.com, but @*.mydomainalias.com as well
dnl FEATURE(masquerade_entire_domain)dnl
dnl MASQUERADE_DOMAIN(localhost)dnl
dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl
dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl
dnl MASQUERADE_DOMAIN(mydomain.lan)dnl

3.
grep ^DM /etc/mail/sendmail.cf

No Output

4.
grep ^C\{M /etc/mail/sendmail.cf

No Output

Please suggest if you spot anything or need more info.
 

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