Checking if your kit is complete... Looks good Writing Makefile for Mail::Postfix::Attr Microsoft (R) Program Maintenance Utility Version 7.10.3077 Copyright (C) Microsoft Corporation. All rights reserved. cp Attr.pm blib\lib\Mail\Postfix\Attr.pm Microsoft (R) Program Maintenance Utility Version 7.10.3077 Copyright (C) Microsoft Corporation. All rights reserved. C:\cpanrun\build\5-10-0\bin\perl.exe "-Iblib\lib" "-Iblib\arch" test.pl 1..3 can't listen on 'postfix_sock' at test.pl line 65. Mail::Postfix::Attr can't connect to 'postfix_sock' at test.pl line 38 # Looks like your test died before it could output anything. NMAKE : fatal error U1077: 'C:\cpanrun\build\5-10-0\bin\perl.exe' : return code '0xff' Stop.