Merge pull request #933 from ioannidesalex/patch-11

Fix Gmail issue with IPv6 exim

install/ubuntu/16.04/exim/exim4.conf.template

@@ -8,6 +8,7 @@
 #SPAM_SCORE = 50
 #CLAMD =  yes
 
+disable_ipv6 = true
 domainlist local_domains = dsearch;/etc/exim4/domains/
 domainlist relay_to_domains = dsearch;/etc/exim4/domains/
 hostlist relay_from_hosts = 127.0.0.1