So I am getting something strange. Some systems get the correct mail header and some do not. They are configured the same way and use DHCP

I researched and found this article :
https://www.linuxquestions.org/quest...domain-484792/

But this is inconstant in my environment. I have this in my host file on a working system (no modification to sendmail.cf file (default one)

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6

We use dhcp
hostname shows :

farscape.mydomain.com

Mail comes to me like this (as I expect it to)

From: logwatch@farscape.mydomain.com [mailto:logwatch@farscape.mydomain.com]
Sent: Thursday, January 28, 2010 12:24 PM
To: root@farscape.mydomain.com
Subject: Logwatch for farscape.mydomain.com(Linux)

No i have the same file on another system the same way and I get this:
From: root_farscape2 [mailto:root@localhost.localdomain]
Sent: Thursday, January 28, 2010 3:31 PM
To: root@localhost.localdomain
Subject: test

I made the changes to sendmail.cf file and that did not work either.
I then updated the host to add farscape2.mydomain.com along with the sendmail.cf file and it worked on those systems that had an issue. I dont understand why or what is happening.

sendmail.cf

cd /etc/mail
cp /etc/mail/sendmail.cf sendmail.cf.date
vi /etc/mail/sendmail.cf
Search for #Dj$w.Foo.com
Add new line
Dj$w.farscape2.mydomain.com

The one that works has not been modified.
Any help would be appreciated.

any thoughts on why this is not working?
seem strange both systems are the exact same build and cfg.

I am wondering why the default cfg works on 1 system and not on another. (we have several systems that work and several that do not)

The problem I am having too is this is DHCP not fixed IP addr so I cannot use the solution as it is written. Adding the host name and IP in the /etc/host file wont work because of DHCP

tried this document and got an error

http://www.linuxserverhowto.com/linu...g-apt-get.html
m4 sendmail.mc >sendmail.cf
sendmail.mc:10: m4: cannot open `/usr/share/sendmail-cf/m4/cf.m4': No such file or directory

So I made some progress. bette rbut still not 100%

I modified /etc/mail/local-host-names and added the server name of

# local-host-names - include all aliases for your machine here.
farscape2

Now I get

From: root_farscape2 [mailto:root@localhost.farscape2.mydomain.com]
Sent: Friday, January 29, 2010 8:55 AM
To: root@localhost.farscape2.mydomain.com
Subject: test2

test

hmmm


/usr/lib/sendmail -d0.1 -bt < /dev/null
Version 8.13.8
Compiled with: DNSMAP HESIOD HES_GETMAILHOST LDAPMAP LOG MAP_REGEX
MATCHGECOS MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6
NETUNIX NEWDB NIS PIPELINING SASLv2 SCANF SOCKETMAP STARTTLS
TCPWRAPPERS USERDB USE_LDAP_INIT

============ SYSTEM IDENTITY (after readcf) ============
(short domain name) $w = localhost
(canonical domain name) $j = $w.farscape2.mydomain.com
(subdomain name) $m = localdomain
(node name) $k = farscape2
========================================================

ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter <ruleset> <address>


Working system...

/usr/lib/sendmail -d0.1 -bt < /dev/null
Version 8.13.8
Compiled with: DNSMAP HESIOD HES_GETMAILHOST LDAPMAP LOG MAP_REGEX
MATCHGECOS MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6
NETUNIX NEWDB NIS PIPELINING SASLv2 SCANF SOCKETMAP STARTTLS
TCPWRAPPERS USERDB USE_LDAP_INIT

============ SYSTEM IDENTITY (after readcf) ============
(short domain name) $w = farscape
(canonical domain name) $j = farscape.mydomain.com
(subdomain name) $m = mydomain.com
(node name) $k = farscape.mydomain.com
========================================================

ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter <ruleset> <address>


So the question is where is the $w and the $m being picked up from....

So I put my sendmail.cf back to defaults and I get this now.
/usr/lib/sendmail -d0.1 -bt < /dev/null
Version 8.13.8
Compiled with: DNSMAP HESIOD HES_GETMAILHOST LDAPMAP LOG MAP_REGEX
MATCHGECOS MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6
NETUNIX NEWDB NIS PIPELINING SASLv2 SCANF SOCKETMAP STARTTLS
TCPWRAPPERS USERDB USE_LDAP_INIT

============ SYSTEM IDENTITY (after readcf) ============
(short domain name) $w = localhost
(canonical domain name) $j = localhost.localdomain
(subdomain name) $m = localdomain
(node name) $k = farscape2
========================================================

ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter <ruleset> <address>


I did a diff on the sendmail.cf from the working system to the non working system and get no diffrences

Hi,

You must define the hostname (and maybe domainname). Run
to see what your hostname is, and
to change it.
To make changes permanent edit /etc/hosts

hostname is set as
hostname
farscape2

the machine gets a dhcp address so how is editing /etc/hosts going ot help?

also the working system and the non working system have similar host files (ie dhcp and no domains listed)

non working machine:
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 farscape2 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
xxx.xxx.xxx.xxx discovery.mydomain.com

working machine host file

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
xxx.xxx.xxx.xxx discovery discovery.fpl.com

Is should be a fully qualified domain name, like farscape2.mydomain.com.
If your dhcp server cannot provide it, consider using masquerading

Regards

Ok I am not sure really why this worked but I did. I changed my host file to be this.

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
xxx.xxx.xxx.xxx discovery.mydomain.com


Notice the absence of the server name in the 127.x line.
restarted and it works now.

It works because the 1st argument after the IP is the important in /etc/hosts. The others are considered aliases.

This has tickled my interest. Is sendmail seeing the connection as coming from 127.0.0.1 or xxx.xxx.xxx.xxx? Do the logs show it as the localhost IP or the actual IP of the sending machine?

yes i understand that but for some reason from the onset it did not work thats why I put the farscape2 2 in the host file. I restarted sendmail.

I then removed it and restarted sendmail and it works now. Thats was puzzling

well i am back to having this issue on another system. this time I tried

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 farscape3 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6

And I get this in email...
From: logwatch@localhost.localdomain [mailto:logwatch@localhost.localdomain]
Sent: Monday, February 15, 2010 4:02 AM
To: root@localhost.localdomain
Subject: Logwatch for farscap3 (Linux)

So by the above statement because i have the host name first localhost should be ignored.
But it is not.