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Configuring Sendmail as a client only, how?


 
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# 1  
Tools Configuring Sendmail as a client only, how?

We are running sendmail-8.13.4 on AIX.

I need to update the configuration and make sendmail act as a relay client only, meaning it will only be used to send mail out of the host and NOT accept mail.

Here is my client.mc config:
Code:
include(`/usr/samples/tcpip/sendmail/m4/cf.m4')
VERSIONID(`sendmail config for aix7')
OSTYPE(`aixsample')dnl
MASQUERADE_AS(`myserver.com')dnl
FEATURE(`masquerade_envelope')dnl
FEATURE(`accept_unresolvable_domains')
FEATURE(`accept_unqualified_senders')
FEATURE(always_add_domain)dnl
FEATURE(`nullclient',`mail-relay.xxxx.myserver.com')dnl
define(`STATUS_FILE', `/etc/mail/statistics')dnl
define(`MAIL_HUB', `myserver.com.')dnl
define(`LOCAL_RELAY', `myserver.com.')dnl

We have an MS Exchange server, so we are basically using sendmail on a particular AIX host to forward all email to the exchange server and let Exchange handle everything.

The above configuration works fine for sending email to recipients using:
Code:
mail user@myserver.com

What I also need to do is be able to send the email with only specifying the alias part and not the domain, so if I do:
Code:
mail user

** sending email to userid, omitting the @myserver.com recipient domain part

I want sendmail to append the @myserver.com in this situation where a domain is not given. Is this possible without maintaining some sort of alias/list file for every possible userid > userid@mydomain.com?

Thanks.

Last edited by c3rb3rus; 04-20-2016 at 06:26 PM.. Reason: rewrite question to be more specific
# 2  
Are you using 'mail' or 'mailx' from the command line, or are your outbound emails essentially program error or status messages?
# 3  
I realized my original question was very confusing, updated to be specific at the issue I am stuck at. We are using the "mail" command included in AIX.
# 4  
Why not simply create your own version of mail.
Code:
user=$1
echo $user|grep @ >/dev/null
if [ $? -ne 0 ]
then
    domain=ourdomain.com
    /usr/bin/mail $user@$domain
else
     /usr/bin/mail $user
fi

Put your version of mail ahead of the system version in your PATH.
# 5  
Our programs and 3rd party programs call the "mail" program directly, so I would need to rename /usr/bin/mail to something else, create my script and call the renamed mail.

Is there a way to do this in the sendmail config (possibly via their very confusing rewrite rules?) so to avoid messing with system binaries.

Last edited by c3rb3rus; 04-21-2016 at 12:28 PM..
# 6  
You don't need to change or rename any system programs.
Assuming that your application programs call 'mail' and not '/usr/bin/mail' then:
In your user .profile change the PATH statement to include '/usr/custombin' first.
Put your version of mail in /usr/custombin.
This seems significantly simpler than working with the sendmail configuration.
 

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