MAIL-ERROR: Remote host said: 553 #5.1.8

[dastradamus]

Hi everyone!

've added a new domain and opened different email accounts. Unfortunately sending a mail appears the following error message - what can I do?

<**.**@****.ch>:
Connected to 194.**.***.** but sender was rejected.
Remote host said: 553 #5.1.8 Domain of sender address <**@*****.ch> does not resolve

--- Below this line is a copy of the message.

Return-Path: <**@*****.ch>
Received: (qmail 16228 invoked from network); 21 Sep 2011 09:40:05 +0200
Received: from localhost (127.0.0.1)
by localhost with SMTP; 21 Sep 2011 09:40:05 +0200
MIME-Version: 1.0
X-Priority: Normal
X-Mailer: AtMail 1.02
Message-ID: <33122.1316590805@*****.ch>
To: <**.**@***.ch>
Reply-To: **@*****.ch
Content-Type: text/plain; charset="utf-8"
X-Origin: 194.**.***.***
X-Atmail-Account: **@*****.ch
Date: Wed, 21 Sep 2011 09:40:05 +0200
Subject: Test
From: **@*****.ch
Content-Transfer-Encoding: quoted-printable