Disable DKIM verification for sent messages.

samples/amavisd/amavisd.conf

@@ -49,6 +49,7 @@ $policy_bank{'MYNETS'} = {   # mail originating from @mynetworks
     os_fingerprint_method => undef,  # don't query p0f for internal clients
     allow_disclaimers => 1, # enables disclaimer insertion if available
     enable_dkim_signing => 1,
+    enable_dkim_verification => 0,
 };
 
 # Postfix will re-route mail from authenticated users to this port.
@@ -57,6 +58,7 @@ $policy_bank{'ORIGINATING'} = {
     originating => 1,         # declare that mail was submitted by our smtp client
     allow_disclaimers => 1,   # enables disclaimer insertion if available
     enable_dkim_signing => 1,
+    enable_dkim_verification => 0,
 
     # notify administrator of locally originating malware
     spam_admin_maps  => ["root\@$mydomain"],
@@ -84,6 +86,7 @@ $policy_bank{'MLMMJ'} = {
     originating => 1,           # declare that mail was submitted by our smtp client
     allow_disclaimers => 0,     # we use 'mlmmj-amime-receive' program to handle disclaimer/footer
     enable_dkim_signing => 1,   # enable DKIM signing for outbound
+    enable_dkim_verification => 0,
     virus_admin_maps => ["root\@$mydomain"],
     spam_admin_maps  => ["root\@$mydomain"],
     smtpd_discard_ehlo_keywords => ['8BITMIME'],