diff --git a/conf/postgrey_whitelist_clients b/conf/postgrey_whitelist_clients
index ee19722b..b209ab5e 100644
--- a/conf/postgrey_whitelist_clients
+++ b/conf/postgrey_whitelist_clients
@@ -17,3 +17,4 @@
 /^box.kroes.email$/
 /^.*.hes.trendmicro.eu$/
 /^smtp-\d+\.steampowered\.com$/
+/^mail-out\d+\.unilogicnetworks\.net$/