Exim4 to relay emails

eximsmtp

I have exim4 installed on a Linux box. The basics work fine and I can send email from that machine without any problem to whatever email address.

I also have a printer/scanner which is capable to send scans as emails. It needs an SMTP gateway to be able to do that. So I give the IP address of that Linux box, changed the configuration a little bit but still cannot get it to work.

After I run dpkg-reconfigure exim4-config, here is what I get in /etc/exim4/update-exim4.conf.conf :

dc_eximconfig_configtype='internet'
dc_other_hostnames=''
dc_local_interfaces='127.0.0.1;192.168.2.2'
dc_readhost=''
dc_relay_domains='mycompanyemail.com'
dc_minimaldns='false'
dc_relay_nets='192.168.2.0/24'
dc_smarthost=''
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname=''
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool'

My problem is that with this configuration, I can only send to emails @mycompanyemail.com… It says I can use wildcard, but when I do that, the '*' is replaced by whatever filename is in the directory where I run all that.

How can I configure it to be able to send emails with any domain ? Or am I doing it wrong ?

EDIT : here is the part of the log that's causing trouble :

2011-08-03 16:28:18 H=(NPI2D389C) [192.168.2.20] F=<scanner@company.cal> rejected RCPT <m......j.....@gmail.com>: relay not permitted

The first part (scanner@company.cal) does not matter. I changed the email address. The point is that if this email is @mycompanyemail.com then everything works fine. Anything else does not work. I could add gmail.com, but I am looking to have any domain working…

Best Answer

You are using "dc_relay_domains='mycompanyemail.com'" and this is the reason why you are able to send mails only to your company mail addresses. This parameter need to be configured only if you need to restrict email delivery and you need to leave it empty to fix your issue.

Actually, the dc_relay_nets is the parameter, that restricts the relay IPs.

Cheers

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Exim4 Disable local delivery

Run dpkg-reconfigure exim4-config, select mail sent by smarthost; no local mail and fill out the asked information.

Exim4 SMTP – How to Send Email Only from Authorized Users

This is similar to my exim setup. From within my network I can send email to any domain, but from outside the network the only mail exim will deliver to is my local domain, unless the user authenticates to exim first. In this way, I can send mail through my mailserver from anywhere in the world, as long as I authenticate first.

Critical sections of my config are:

domainlist local_domains = @ : example.com
domainlist relay_to_domains =
hostlist   relay_from_hosts = 127.0.0.1 : 192.168.0.0/24 : 2001:111:1111::/64

This basically sets my local domain for which exim knows is 'home' to example.com. It also sets out the subnet ranges for which exim is allowed to relay any mail. relay_to_domains is blank, because there are no other domains for which I blanket will relay to, other than example.com.

tls_advertise_hosts = *

I advertise TLS availability so that any client can authenticate over TLS.

acl_check_rcpt:
    [...]
    accept  hosts         = +relay_from_hosts
    accept  authenticated = *
    require message = relay not permitted
        domains = +local_domains : +relay_to_domains

This acl does some checks on where the mail is going, and who sent it before deciding whether or not to relay. The first line relays mail from hosts within the previously defined internal network. The second line relays mail from any authenticated user. The third and fourth require that if any previous condition has not been met, only relay for my local domains.

The final section is the authenticators, so that exim knows what an authenticated user looks like. Mine looks like this:

plain_saslauthd_server:
  driver = plaintext
  public_name = PLAIN
  server_condition = ${if saslauthd{{$auth2}{$auth3}}{1}{0}}
  server_set_id = $auth2
  server_prompts = :

login_saslauthd_server:
  driver = plaintext
  public_name = LOGIN
  server_prompts = "Username:: : Password::"
  # don't send system passwords over unencrypted connections
  server_condition = ${if saslauthd{{$auth1}{$auth2}}{1}{0}}
  server_set_id = $auth1

Obviously this requires an exim build that's got sasl capability compiled, along with a working SASL daemon on the system. I use Cyrus SASLD and from memory, it's fairly simple to install and forget about.

I'm actually running this on OpenBSD, so not sure how these steps would exactly translate to a split-config Ubuntu box. However, it should be enough to get you going :)

Best Answer

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Exim4 SMTP – How to Send Email Only from Authorized Users

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