diff --git a/SpywareFilter/sections/specific.txt b/SpywareFilter/sections/specific.txt
index 39137a81ad4..d543ee6f6e2 100644
--- a/SpywareFilter/sections/specific.txt
+++ b/SpywareFilter/sections/specific.txt
@@ -3488,6 +3488,9 @@ link.gmapp*.net$image
 ! it's problematic that due to how Gmail proxy work, these domains aren't even exposed on the network level
 ! fortunately, extensions can see them (Gmail puts the real URL in the location.hash part of the src)
 !
+! 33mail.com
+33mail.com%2Fpage%2Fopened$image
+33mail.com/page/opened$image
 ! Zalando
 probe.zalando.com$image
 ! omeda.com