Hi all
Whenever my logwatch application sends me emails it sends them out using root@localdomain.localhost..the thing is I do not want to change the current config in /etc/hosts but I do wish for emails sent through root to be sent as root@b.c for example.
Any guidance please ?

What distribution?

Try putting "b.c" in /etc/mailname. If your distro is Debian or Debian-like that should do it; if not, I know not whether that will work or not.

The default is to mail to root. If you want it to mail to root@yourdomain.com then change /etc/logwatch/conf/logwatch.conf so it says:

MailTo = root@yourdomain.com

Clarification please, OP: Is the mail going to the wrong address or is it appearing to be from the wrong address?

The distro is RHEL3..the outgoing address is root@localhost.localdomain ..I want it to appear as root@myhost.com without having to set myhost in the /etc/hosts file

Okay, did you try /etc/mailname?

I had the same problem, and i found the solution in:
http://www.linuxhomenetworking.com/w..._Email_Address

I copy the solution here just in case

#########FROM LINUXHOMENETWORKING.COM#############

Using Sendmail to Change the Sender's Email Address

Sometimes masquerading isn't enough. At times you may need to change not only the domain of the sender but also the username portion of the sender's e-mail address. For example, perhaps you bought a program for your SOHO office that sends out notifications to your staff, but the program inserts its own address as sender's address, not that of the IT person.

Web-based CGI scripts tend to run as user apache and, therefore, send mail as user apache too. Often you won't want this, not only because apache's e-mail address may not be a suitable, but also because some anti-spam programs check to ensure that the From:, or source e-mail address, actually exists as a real user. If your virtusertable file allows e-mail to only predefined users, then queries about the apache user will fail, and your valid e-mail may be classified as being spam.

With sendmail, you can change both the domain and username on a case-by-case basis using the genericstable feature:

1) Add these statements to your /etc/mail/sendmail.mc file to activate the feature:

FEATURE(`genericstable',`hash -o /etc/mail/genericstable.db')dnl
GENERICS_DOMAIN_FILE(`/etc/mail/generics-domains')dnl

2) Create a /etc/mail/generics-domains file that is just a list of all the domains that should be inspected. Make sure the file includes your server's canonical domain name, which you can obtain using the command:

sendmail -bt -d0.1 </dev/null

Here is a sample /etc/mail/generics-domains file:

my-site.com
another-site.com
bigboy.my-site.com

3) Create your /etc/mail/genericstable file. First sendmail searches the /etc/mail/generics-domains file for a list of domains to reverse map. It then looks at the /etc/mail/genericstable file for an individual email address from a matching domain. The format of the file is

linux-username username@new-domain.com

Here is an example:

alert security-alert@my-site.com
peter urgent-message@my-site.com
apache mailer@my-site.com

4) Run the sendmail restart script from the beginning of the chapter and then test.

Your e-mails from linux-username should now appear to come from username@new-domain.com.


#######################################################



Good luck.

3 members found this post helpful.

I'm not sure if the OP wanted to do this on a per email basis or permanently so below is how to change it on a per email basis.

You use the "-f" switch to change the FROM address.

1 members found this post helpful.

May I borrow your time machine?