> Invalid email addresses > Abc.example.com (an @ character must separate the local and domain parts) Well, that also depends on the context because replacing

> Invalid email addresses > Abc.example.com (an @ character must separate the local and domain parts) Well, that also depends on the context because replacing @ with a dot is exactly what you'd do in a zone file: $ dig soa google.com +short ns1.google.com. dns-admin.google.com. 2012113000 7200 1800 1209600 300 So it gets even hairier.