Since this is a email address, we should prefix it with
mailto:, otherwise some clients (i.e. search bots) will try
to use it as a relative URL.
<html lang="[% lang %]">
<head>
<title>[% organisation %] -- [% title_tag %]</title>
-<link rev="made" href="[% admin.mail %]">
+<link rev="made" href="mailto:[% admin.mail %]">
<meta http-equiv="Content-Type" content="text/html; charset=[% charset %]">
<meta name="Author" content="[% admin.name %], [% admin.mail %]">
<meta name="Description" content="[% description %]">