MEDIUM: Support sending email alerts

Signed-off-by: Simon Horman <horms@verge.net.au>
diff --git a/src/server.c b/src/server.c
index 9a3bf23..6acd332 100644
--- a/src/server.c
+++ b/src/server.c
@@ -255,6 +255,7 @@
 	             "%sServer %s/%s is DOWN", s->flags & SRV_F_BACKUP ? "Backup " : "",
 	             s->proxy->id, s->id);
 
+	send_email_alert(s, "%s.", trash.str);
 	srv_append_status(&trash, s, reason, xferred, 0);
 	Warning("%s.\n", trash.str);