LinuxQuestions.org - sendmail - Sending emails from the machine with name of the HOSTNAME

- Linux - Server (https://www.linuxquestions.org/questions/linux-server-73/)

- - sendmail - Sending emails from the machine with name of the HOSTNAME (https://www.linuxquestions.org/questions/linux-server-73/sendmail-sending-emails-from-the-machine-with-name-of-the-hostname-934601/)

sendmail - Sending emails from the machine with name of the HOSTNAME

Hi,

In my server I work with sendmail, for a long time I try to send emails from user "root" and get this mail with full name of the HOSTNAME machine. but in the from I only see "root" and not root@myhostname.com, when I add the LOCAL_USER(`root')dnl to /etc/mail/submit.mc file, it's work i see the root@myhostname.com but if I try to send mail from user "root" like - echo "bla" | mail -s "test" root i get this error: "root... User address required"

in addition, I use a file ".forward"

anybody know as a problem and know the solution ?

If there is a solution with "aliases" file, I like to see an example...

Thanks, Oz.

http://www.linuxhomenetworking.com/w...x_Mail_Servers
the chapter "Using Sendmail to Change the Sender's Email Address " might be of interest....

or, kill sendmail, and stat using postfix :D

Hi JSkywalker,
Thanks for the help...
it work's, but if I send mail from "root" user I get the mail from "root" and not from "root@e1.mydomain.com"
is there anything else you could recommend ?

thanks again,
Oren.

sendmail masquerading

Oz,
There is a useful explanation of masquerading written by Eric Himself(tm) here.
It sounds like you need to use EXPOSED_USER(`usernames') or EXPOSED_USER_FILE(`filename') in your sendmail.mc to ensure that the hostname is not masqueraded for system messages. You shouldn't need to mess with submit.mc. You might consider starting with a clean source tree and building a new sendmail.cf having modified only your sendmail.mc.

Here is an easy cheat sheet for building sendmail and its config files.

A quick question - I have noticed that system email arrive as sent from "root<root@e1.mydomain.com>", so in a way sendmail already adds the localhost.localdomain.
The problem is with the attached nickname (e.g. root<>), which makes it harder for us to read from cellular devices. Emails sent from other users arrive as sent from the raw address (e.g. "user@e1.wizaboo.com"). Do you have any idea how can we strip the nickname from the root user as well?

sendmail address re-writing

Oz,
You can use the genericstable to re-write local addresses, both "From:" addresses and envelope addresses, to anything you choose. First, make the needed changes to your sendmail.mc:

Code:

FEATURE(genericstable, hash /etc/mail/genericstable)

GENERICS_DOMAIN(SERVER1.domain.com)

FEATURE(masquerade_envelope)

Then, from the location in your sendmail source tree that has both the sendmail.mc and a copy of the "Build" script, do a "./Build sendmail.cf". That will build a valid sendmail.cf, which you can drop into /etc/mail. Make sure to back up your original /etc/mail/sendmail.cf first. Next, build the /etc/mail/genericstable. It will have entries like this:

Code:

root:  root@SERVER1.domain.com

postgres:  postgres@SERVER1.domain.com

Do the following to create the keyed database with the M4 macro processor:

Code:

makemap hash /etc/mail/genericstable.db < /etc/mail/genericstable

You have to restart sendmail now. Not so that it can read genericstable.db, but to get it to re-read sendmail.cf.

Do something that causes system messages to be generated. Your sender address and envelope address should be masqueraded to the same address.

Thanks,
I'll try to do it!

Thanks again :)
Oz.