Sending emails using IP address per domain in exim

To be able to send mails via different IP per domain, You need to do the following changes in the /etc/exim.conf file:

Find the remote_smtp: part, and add line

interface = "${lookup{$sender_address_domain}lsearch{/etc/virtual/domainips}{$value}}"

It should look something like: exim.conf

remote_smtp:
  driver = smtp
  interface = "${lookup{$sender_address_domain}lsearch{/etc/virtual/domainips}{$value}}"

File /etc/virtual/domainips syntax:

domain.tld: ip.add.re.ss

That’s it. Create the domainowners file, restart exim, and You are all set!

script for automatic add domain/ip to domainips file

populateDomainIPs.sh

#!/bin/sh
 
LIST=`/bin/cat /etc/virtual/domainowners | tr -d ' '`
echo -n '' > /etc/virtual/domainips
 
for LINE in $LIST; do
 USER=`echo $LINE | cut -d: -f2`
 DOMAIN=`echo $LINE | cut -d: -f1`
 if [ -f "/usr/local/directadmin/data/users/$USER/domains/$DOMAIN.conf" ]; then
 IP=`/bin/grep 'ip=' /usr/local/directadmin/data/users/$USER/domains/$DOMAIN.conf | cut -f2 -d=`
 [ -z $IP ] || echo "$DOMAIN: $IP" >> /etc/virtual/domainips
 fi
done
 
exit 0;

note: You may add this script to cron, for automatic ‘domainips’ updates.