Hi Guys,

Just joined the forum though I have been lurking here for many years now.

Wondering if anyone can help me out with a problem that I'm currently having.

I have a few servers that are relaying all email off of the box to an exchange server. There is a SmartHost configured in sendmail.cf

The problem is, is that it relaying ALL emails, even the emails bound for local users. I have another box which is working correctly and only relaying "external" email. I have checked though and compared the sendmail.cf, submit.cf (not in use), domaintable, access and local-host-names as well as the /etc/hosts and /etc/aliases file and they all appear to be identical in both cases.

I've thought that it could be some issue with the /etc/hosts as on the broken server it has several entries for itself pointing it's own IP address;

IP ADDRESS broken_server.domain.com

On the working Server these entries are not present so I decided to replicate the local IP address entries on the working server in the hope that this would break it in the same fashion. It didn't.

I've been toying with the idea of using the -

Code:

Cwlocalhost
# file containing names of hosts for which we receive email
Fw/etc/mail/local-host-names

and/or the Class L -

Code:

# class E: names that should be exposed as from this host, even if we masquerade
# class L: names that should be delivered locally, even if we have a relay
# class M: domains that should be converted to $M
# class N: domains that should not be converted to $M
#CL root
C{w}localhost.localdomain

.... to try and put a "sticking plaster" on the situation but would like to understand the odd behaviour if possible.


Working Server

[root@working_server.domain.com mail]# sendmail -bvv username
username... deliverable: mailer local, user username

[root@working_server.domain mail]# sendmail -bvv username@working_server
username@working_server... deliverable: mailer local, user username

[root@working_server.domain mail]# sendmail -bvv username@working_server.domain.com
username@working_server.domain.com... deliverable: mailer local, user username

[root@working_server.domain mail]# sendmail -bvv username@remote_domain.com
username@endava.com... deliverable: mailer relay, host [MAIL_RELAY IP ADDRESS], user username@endava.com



Not Working - Should keep all of these emails local

[root@broken_server.com.domain mail]# sendmail -bvv username
username... deliverable: mailer local, user username
Fine

[root@broken_server.domain.com mail]# sendmail -bvv username@localhost
username@localhost... deliverable: mailer local, user username
Fine

[root@broken_server.domain.com mail]# sendmail -bvv username@localhost.localdomain
username@localhost.localdomain... deliverable: mailer local, user username
Fine

[root@broken_server.domain.com mail]# sendmail -bvv username@broken_server
username@broken_server... deliverable: mailer relay, host [MAIL_RELAY IP ADDRESS], user username@broken_server.domain.com
Borked

[root@broken_server.domain.com mail]# sendmail -bvv username@broken_server.domain.com
username@broken_server.domain.com... deliverable: mailer relay, host [MAIL_RELAY IP ADDRESS], user username@broken_server.domain.com
Borked


Any ideas gents?