Hi. from few senders I get mails with strange headers, i.e.: Return-Path: <mailing@oferent.com.pl> Received: from mx4.gbp.pl (91.208.44.234) (HELO mx4.gbp.pl) by plan.home.pl (79.96.46.55) with SMTP (IdeaSmtpServer v0.80.2) id f7130bce86082296; Mon, 11 Jul 2016 19:45:38 +0200 Received: (qmail 4711 i...