Return-Path: <foo@mail.com> From: Foo <foo@mail.com> To: some_group@bar.com, alice@foo.com Cc: bob@FOO.com, carol@example.com Date: Fri, 15 Jan 2016 00:12:43 +0100 Message-ID: <51@foo.bar.mail> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Email from a domain on blocklist or allowlist.