Hi guys. I am just trying to make a new router for exim4 to skip the smarthost for any domains I list in a file. I have put below what I've written in the config file but I seem to be having no luck. Can anyone shed some light on what I am doing wrong? Thanks To build the domainlist I have tried the following 2 methods # domainlist domains_skip_smarthost = /etc/exim4/domains_skip_smarthost domainlist domains_skip_smarthost = ${lookup{$domain}lsearch{/etc/exim4/domains_skip_smarthost}} The file domains_skip_smarthost contains the following line: testdomain.com:testdomain2.com And this is what I have in my router section. If I use the commented part and list the domains there it works fine, but when I try to use the +domains_skip_smarthost I have no luck. dnslookup_skip_smarthost: debug_print = "R: dnslookup_skip_smarthost for $local_part@$domain" driver = dnslookup domains = +domains_skip_smarthost # domains = testdomain.com:testdomain2.com transport = remote_smtp same_domain_copy_routing = yes no_more