Send mail as hostname@example.com instead of root@example.com

emaileximpostfix

I'm trying to have emails sent as hostname@example.com. Hostname being the name of the machine. This way I know which machines are sending me alerts.

Running postfix on Debian 8. I created a generic file and listed

root@example.com    hostname@example.com

Ran postmap generic and restarted postfix after modifying the main.cf to reference the generic file.

When I send mail as root, it still arrives as root@example.com on the postfix server.

Any ideas what I'm doing wrong?

On a non-postfix machine, just running exim4, emails are sent as hostname@example.com but with the root in the from field (name). How can I remove the name? Do I just remove the name root from /etc/passwd ?

Best Answer

The only thing you have to do is to add appropriate line to the begin rewrite section of exim's config:

begin rewrite
  . . . . . .
  root@example.com    hostname@example.com    Ffrsw

Here flags Ffrs defines what headers will be rewrited:

F = ENVELOPE FROM
f = FROM
r = RETURN-PATH
s = SENDER
w = Complete rewrite, i.e. <Root> root@example.com become hostname@example.com

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Postfix – Redirect All Emails to One User

luser_relay = user@example.com in your main.cf is what you want.

To disable user checking and accept all mails you need to add the local_recipient_maps = option. Documentation

Exim4 redirect mail sent to @domain1.example.com to @domain2.example.com

Please use example.com instead of domain2.com, example.com (and .org .net) was specifically created for examples and documentation.

In your /etc/exim4/update-exim4.conf.conf you have configured:

dc_use_split_config='false'

However you are changing something in /etc/exim4/conf.d/router/999_exim4-config_redirect which will be ignored because you are not using split configuration.

Either do:

dc_use_split_config='true'

And reload exim4, you may prefer to change it using:

dpkg-reconfigure exim4-config

Or edit /etc/exim4/exim4.conf.template to add your customisations instead and reload exim4 once done.

Debian exim4 has a feature called hubbed_hosts which can be a convenient way to accomplish what you want without having to add your own routers et al.

So if your want your server to send email destined for domain example.org to domain example.com which has MTAs listening on IPs 192.0.2.1 and 192.0.2.10 you do the following:

Create /etc/exim4/hubbed_hosts and add:

example.org: 192.0.2.1:192.0.2.10
reload exim4

Note, no spaces between the IP addresses and they're separated by a colon ':'

What this does is it will relay email destined for example.org to IPs 192.0.2.1,192.0.2.10 (in my example the IPs of example.com). It therefore will ignore the MX records of that domain. The IP address could be anything, as long as it is configured to receive those emails.

Finally there is address rewriting, see: http://www.exim.org/exim-html-current/doc/html/spec_html/ch31.html Perhaps it has something that will fit your requirements. You could use it in addition to hubbed_hosts.

Best Answer

Related Solutions

Postfix – Redirect All Emails to One User

Exim4 redirect mail sent to *@domain1.example.com to *@domain2.example.com

Related Topic

Exim4 redirect mail sent to @domain1.example.com to @domain2.example.com