From Debian package 0.2.20091117-2
Updated in 0.2.20100524-6

Add dkim_stream_connect interface.
Allow postfix to talk to dkim.

This was present in Russell's old dkim module, which was superseded by
upstream 5a6b1fe2 (2009-09-17)

0.2.20100524-6
  * Fixed a bug in the previous release that stopped MTAs from talking to
    the dkim-milter, the .if file had the wrong type.

Index: policy/modules/services/dkim.if
===================================================================
--- policy/modules/services/dkim.if.orig
+++ policy/modules/services/dkim.if
@@ -1 +1,20 @@
 ## <summary>DomainKeys Identified Mail milter.</summary>
+
+########################################
+## <summary>
+##      Connect to dkim-milter.
+## </summary>
+## <param name="domain">
+##      <summary>
+##      Domain allowed to connect.
+##      </summary>
+## </param>
+#
+interface(`dkim_stream_connect',`
+	gen_require(`
+		type dkim_milter_t, dkim_milter_data_t;
+	')
+
+	stream_connect_pattern($1,dkim_milter_data_t,dkim_milter_data_t,dkim_milter_t)
+')
+
Index: policy/modules/services/postfix.te
===================================================================
--- policy/modules/services/postfix.te.orig
+++ policy/modules/services/postfix.te
@@ -618,6 +618,11 @@
 ')
 
 optional_policy(`
+	dkim_stream_connect(postfix_smtpd_t)
+	dkim_stream_connect(postfix_cleanup_t)
+')
+
+optional_policy(`
 	sasl_connect(postfix_smtpd_t)
 ')