I have configured SMTP service on a windows 2008 server. All the emails sent by the SMTP service are flagged as spam or they are rejected by the recipient of the email.

In the header of the email I noticed 

```
X-AUTH-Result: FAIL
X-SID-Result: FAIL

```

and

```
spf=fail .... x-hmca=fail** 

```

I hope someone could explain why the verification of email is failing.

The full email header:

```
x-store-info:sbevkl2QZR7OXo7WID5ZcdV2tiiWGqTnu/L+UA0lIUkdujfCEDe9TejEOcHgYvKQaXRRlSrWyA9F82Xi5yFzUoAr8R2ZN2NgyjgYojpTVH5cVYPT0s7sOARewS8iL50FwtnQ3lCq1F0=
Authentication-Results: hotmail.com; spf=fail (sender IP is 19x.18x.12x.16x) smtp.mailfrom=test@example.com; dkim=none header.d=example.com; x-hmca=fail header.id=test@example.com
X-SID-PRA: test@example.com
X-AUTH-Result: FAIL
X-SID-Result: FAIL
X-Message-Status: n:n
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0xO0Q9MTtHRD0xO1NDTD0z
X-Message-Info: NhFq/7gR1vQhAh5Uns46VTwR4xRSvuAW0HDEmwtlGrJLRuPzYbcrweQc9/vi5y7tv/wPRYnDZxALMzu9XvL/UwdbytE0Lv6jUK7MkoBTn/O4Oia7TV+9F0vdvB/+1N9IKagPiODLVNjh/MYiPUW3i/ADUKyMTaK95RazlUvygznVkxGQaoJMveekXLnmzoSYKHHVVeQpF/Tka0PsrTomstRGz57bj50Y
Received: from VPSxxx ([19x.18x.12x.16x]) by SNT0-MC2-F42.Snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
     Mon, 24 Feb 2014 03:06:51 -0800
Received: from VPSxxx ([127.0.0.1]) by VPSxxx with Microsoft SMTPSVC(6.0.3790.4675);
     Mon, 24 Feb 2014 12:06:51 +0100
thread-index: Ac8xUIUYu8qH5earTVaHpdUmHexXQA==
Thread-Topic: test
From: "test" <test@example.com>
To: <xxxxx@hotmail.com>
Subject: test
Date: Mon, 24 Feb 2014 12:06:51 +0100
Message-ID: <422D954CFCD743E9B5DD2BAB5713896E@VPSxxx>
MIME-Version: 1.0
Content-Type: text/plain;
    charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft CDO for Windows 2000
Content-Class: urn:content-classes:message
Importance: normal
Priority: normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.4913
Return-Path: test@example.com
X-OriginalArrivalTime: 24 Feb 2014 11:06:51.0731 (UTC) FILETIME=[851AE230:01CF3150]

test

```