COOK-1442 Adding conditional in case domain is missing (e.g. Vagrant).
COOK-1442 Adding conditional in case domain is missing (e.g. Vagrant).

chrodriguez/postfix,clkao-cookbooks/postfix,interactive-investor-ltd/postfix,leoditommaso/postfix,elliotkendallUCSF/postfix,harmdewit/postfix,NREL-cookbooks/postfix,cookbooks/hw-postfix,opscode-cookbooks/postfix,yakara-ltd/postfix,tezz123/postfix,chef-cookbooks/postfix,atomic-penguin/postfix,claco/postfix,nebulab/postfix,jdamick/postfix,rackspace-cookbooks/rackspace_postfix,yakara-ltd/postfix,Lostmyname/postfix,Agiley/postfix,kkeane/postfix,interactive-investor-ltd/postfix,VertiPub/postfix,mlyndaker/postfix,heat-cookbooks/postfix,brint/postfix,jusbrasil/postfix-cookbook,ashmere/postfix,CarnegieLearningWeb/chef-postfix,mawatech/postfix,eric-al/postfix,jusbrasil/postfix-cookbook,tinderfields/postfix,flaccid/postfix,gensen/postfix,djwhitt/chef-postfix,gnowxilef/cookbook-postfix,chrisjbray/postfix,voroniys/postfix,aki77/postfix,paabulaabu/postfix,tanordheim/opscode-chef-postfix,nilroy/postfix,team-lab/lab-chef-postfix,tas50/postfix,mlyndaker/postfix,opscode-cookbooks/postfix,higanworks-cookbooks/postfix,L2G/postfix,CarnegieLearningWeb/chef-postfix,Koded/postfix,voroniys/postfix,mawatech/postfix,chef-cookbooks/postfix,petere/postfix,fabn/postfix,heat-cookbooks/postfix,zuazo-forks/chef-cookbooks-postfix,chrisjbray/postfix,gnowxilef/cookbook-postfix,nilroy/postfix,Lostmyname/postfix,nbudin/postfix,cookbooks/oc-postfix,tcroiset/postfix,Maks3w/postfix,tigris/postfix,zuazo-forks/chef-cookbooks-postfix,tejaycar/postfix,nuoyan/postfix,rafaelmagu/postfix,ianneub/postfix,i11/postfix,leoditommaso/postfix