Question

1

Can exim be configured to send all emails externally?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 6095 / 1 Year ago, fri, december 23, 2022, 5:55:14

How do I configure exim4 to route all emails via a third-party SMTP server when the sender's domain, recipient's domain, and server hostname all match?

I followed this great answer and have exim4 sending emails to addresses at other domains tested and working from an Ubuntu server. My only issue is that emails where both the sender and recipient share the same domain as the server hostname, they never leave the server (and this is the expected behavior).

For example, sending from [email protected] --> [email protected] works fine, but sending from [email protected] --> [email protected] just routes the mail locally to /var/mail/account2, without passing through the third-party SMTP server.

I'm using Google Apps at my own domain and want to send emails from [email protected] to [email protected] from a machine with the hostname example.com.

I want to route them through Google's SMTP server so I see them in my other email clients. Is this possible?

Very similar questions (but for postfix) here and here.

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

restlerfin

Add To Favorites

Follow

Total Points: 347

Total Questions: 112

Total Answers: 108

Location: Ukraine

Member since Wed, Dec 16, 2020

3 Years ago

answered 1 Year ago ularousand · Accepted Answer

If you followed the guide linked in my question you have about a dozen different 'routers' (simple text files) in /etc/exim4/conf.d/router/. The one to edit is 200_exim4-config-primary, like so:

sudo nano /etc/exim4/conf.d/router/200_exim4-config_primary

Down the bottom is a section 'smarthost:' that looks like this:

smarthost:

  debug_print = "R: smarthost for $local_part@$domain"

  driver = manualroute

  domains = ! +local_domains

  transport = remote_smtp_smarthost

  route_list = * DCsmarthost byname

  host_find_failed = defer

  same_domain_copy_routing = yes

  no_more

Remove the exclamation point and a space from the 'domains' line so that it looks like this:

  domains = +local_domains

That two-character edit was all it took to get everything working just now. Tested and working with Google Apps at my domain on Ubuntu Server 12.04 + Exim & thanks to Stefan for the clue!