diff --git a/data/category-communication b/data/category-communication
index 4da8cf45..6756e045 100644
--- a/data/category-communication
+++ b/data/category-communication
@@ -4,6 +4,7 @@ include:freenode
 include:intercom
 include:keybase
 include:line
+include:mailcom
 include:matrix
 include:messenger
 include:signal
diff --git a/data/mailcom b/data/mailcom
new file mode 100644
index 00000000..f9479e8f
--- /dev/null
+++ b/data/mailcom
@@ -0,0 +1,5 @@
+# 1&1 Mail & Media GmbH
+mail.com
+ui-portal.de
+uicdn.com
+uimserv.net