diff --git a/conf/postgrey_whitelist_clients b/conf/postgrey_whitelist_clients
index b209ab5e..d4421a39 100644
--- a/conf/postgrey_whitelist_clients
+++ b/conf/postgrey_whitelist_clients
@@ -18,3 +18,4 @@
 /^.*.hes.trendmicro.eu$/
 /^smtp-\d+\.steampowered\.com$/
 /^mail-out\d+\.unilogicnetworks\.net$/
+/^serv\d+\.emsrv\.eu$/