I am quite new in setting up e-mail server on linux - I barely set up the whole think to get it working and connected it with my domain and php script which uses PHPMailer 5.2.1. In my setting I am using smtp server from my web provider (domain) and all e-mail which are not defined (trash) are sent on one simple address like I have address [email protected]. So when somebody will send email to [email protected] it will be forwarded again to [email protected] even in case of failure. I am receiving emails like: Hi. This is the qmail-send program at comercio.interone.com.br. I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. <[email protected]>: Sorry, no mailbox here by that name. (#5.1.1) --- Below this line is a copy of the message. Return-Path: <[email protected]> Received: (qmail 49156 invoked from network); 25 Jun 2012 07:34:57 -0300 Received: from unknown (HELO S0106602ad08df877.no.shawcable.net) (70.66.34.103) by hosting.interone.com.br with SMTP; 25 Jun 2012 07:34:57 -0300 Message-Id: <20120625034039.B45C12DCC3B13A22F261@GANDERTO-015445> From: Ezra Whitehead <[email protected]> To: toa <[email protected]> Reply-To: Jamey Mcconnell <[email protected]> Subject: Welcome toa Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Visit our shop http://44090.medicneed.ru/ 113B726C73560AA41A68163AA474D5F1476 0225770686522678 As you can see there is line From: Ezra Whitehead <[email protected]> I am sure I did not send this email from my domain.com with some Davis8FB name and some russian page. This is just one of many and only NOT-delivered e-mails - there can be much more which has been sent successfully! What do I have wrong in my settings? How can I make it right? What should I do to prevent these messages to send? Where should I look? Thank you all.