Index: skins/default/mail.css
===================================================================
--- skins/default/mail.css	(revision de2e0bfeb8bf6884ae4185b94d495a55322348ae)
+++ skins/default/mail.css	(revision bfcef678a8d8e65b62e65f7b48be4b99557f44cb)
@@ -568,4 +568,9 @@
 }
 
+#messagelist thead tr td.size
+{
+  text-align: left;
+}
+
 #messagelist tr td.from,
 #messagelist tr td.to