diff --git a/skins/elastic/styles/colors.less b/skins/elastic/styles/colors.less
index 0c2d090de..6d25b4640 100644
--- a/skins/elastic/styles/colors.less
+++ b/skins/elastic/styles/colors.less
@@ -136,6 +136,8 @@
 @color-blockquote-1-border:         green;
 @color-blockquote-2-border:         #b00;
 
+@color-mail-signature:              #aaa;
+
 @color-spellcheck-link:             #b91414;
 
 @color-table-border:                #e9ecef; /* from Bootstrap */
diff --git a/skins/elastic/styles/widgets/mail.less b/skins/elastic/styles/widgets/mail.less
index 45241815e..bd7e23a16 100644
--- a/skins/elastic/styles/widgets/mail.less
+++ b/skins/elastic/styles/widgets/mail.less
@@ -127,6 +127,12 @@ div.message-htmlpart {
     }
 }
 
+div.message-part {
+    span.sig {
+        color: @color-mail-signature;
+    }
+}
+
 div.message-partheaders {
     /* TODO */
 }