Problem with sending mail

[pietje63]

I recently added a domain to my account. When I use webmail to send an e-mail, it goes to Hotmail's spam folder for all 3 persons I tested.
The questions are
1. Why?
2. How to prevent.

@1 is it maybe related to headers? There are quire some references to X10, are spam filters maybe triggered by the fact that the e-mail domain is not equal to the mail server domain?

x-store-info:J++/JTCzmObr++wNraA4Pa4f5Xd6uensKMvPmf3fencoV9UY7D6u6ajFQVnzuqkpksOhKujp8mUJpQMzSdvmSVN08Brj0PG9BmCf5zm1LwOhSf/0Gt40fLta3QPAjAXRLlpH0yuJP68=
Authentication-Results: hotmail.com; spf=none (sender IP is 198.91.80.251) smtp.mailfrom=ceremoniemeesters@MYDOMAIN.nl; dkim=none header.d=MYDOMAIN.nl; x-hmca=none header.id=ceremoniemeesters@MYDOMAIN.nl
X-SID-PRA: ceremoniemeesters@MYDOMAIN.nl
X-AUTH-Result: NONE
X-SID-Result: NONE
X-Message-Status: n:n
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0xO0Q9MTtHRD0xO1NDTD0w
X-Message-Info: NhFq/7gR1vQ0cE18QlO6eZwutJG1EkyMEM9Y8C9TifbQ4kN9HW4uqk2eoOEBiyjhhbtwpaQzT+I3Hpxu+fPhFMKNRgNLYG6QyG9aD+I92QcX0wi3LQsmUfV3ZfuT9vyBmEB1bF0gwaS1SdfBWTA3pVFQ3jc51oVKgPkPqOnA4EAvmmwyBeGQ3NL2AxSKHwWYyZ66Md9unysiWTHO8QaX0EhDL8fAboFZ
Received: from edge.x10hosting.com ([198.91.80.251]) by SNT004-MC2F31.hotmail.com with Microsoft SMTPSVC(7.5.7601.22751);
Mon, 19 Jan 2015 11:52:02 -0800
Received: from localhost (localhost.localdomain [127.0.0.1])
by edge.x10hosting.com (Postfix) with ESMTP id 1F6DF9FFD1E
for <MYMAIL@hotmail.com>; Mon, 19 Jan 2015 14:52:02 -0500 (EST)
X-Virus-Scanned: amavisd-new at edge.x10hosting.com
Received: from edge.x10hosting.com ([127.0.0.1])
by localhost (edge.x10hosting.com [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id okaF349Ncbcq for <MYMAIL@hotmail.com>;
Mon, 19 Jan 2015 14:52:01 -0500 (EST)
Received: from xo3.x10hosting.com (xo3.x10hosting.com [198.91.81.3])
by edge.x10hosting.com (Postfix) with ESMTP id 0F9C49FFD1C
for <MYDOMAIN@hotmail.com>; Mon, 19 Jan 2015 14:52:01 -0500 (EST)
Received: from localhost ([127.0.0.1]:39816 helo=MYDOMAIN.nl)
by xo3.x10hosting.com with esmtpa (Exim 4.82)
(envelope-from <ceremoniemeesters@MYDOMAIN.nl>)
id 1YDIMj-002Sou-GS
for MYMAILhotmail.com; Mon, 19 Jan 2015 14:52:01 -0500
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII;
format=flowed
Content-Transfer-Encoding: 7bit
Date: Mon, 19 Jan 2015 14:52:01 -0500
From: ceremoniemeesters@MYDOMAIN.nl
To: MYMAIL@hotmail.com
Subject: hoi test
Message-ID: <458c4ea17fb10b9d0b0442e8b16654d8@MYDOMAIN.nl>
X-Sender: ceremoniemeesters@MYDOMAIN.nl
User-Agent: Roundcube Webmail/1.0.1
Return-Path: ceremoniemeesters@MYDOMAIN.nl

I tried to fix this by sending via a mail application, but mail.13juni2015.nl (my domain) does not seem to be working. Can an admin maybe check whether it is correctly configured?

Any other thoughts? Is it maybe due to the fact that the domain is new?