用于网站的Windows server 2008 SMTP服务

我正在使用.net应用程序，需要向客户发送电子邮件。我正试图找出发送电子邮件的最佳解决方案。以下是我所考虑的你能建议一下最好的方式吗？

1>Windows server 2008 in built smtp
service.

2>Exchange server hosted in our
datacenter.

3>Use google apps for sending
emails(Basically same as gmail like
for custom domain).

我已经探索了所有的选择，下面是调查结果

1>I think would be way to go. Also
supports drop in directory to send
emails so can achieve disconnected
email activity.

2>Application would be tied up with
availability of exchange server and
we dont have any exchange server
support personal. Only developers
poke around in exchange server and
got it working. So if option 1 is as
good as 2 then would like to go with 1. 
Is there any drop in directory feature in exchange server like 1?

3>Tried gmail smtp stuff didnt
work. I was receiving timeout error.
Also there is no guarantee that
gmail will send our mail
reliability. They can decide anytime
to stop sending our mails as we are
using free standard version of
google apps.

其他问题：

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我在windows server 2008中安装了smtp服务。现在要使用它，我需要更改任何MX记录和任何内容吗？我需要做什么，以便它可以发送电子邮件使用我的域名。或者它可以为任何域发送电子邮件？

我会使用1和2的混合。使用本地SMTP，但将其中继到exchange服务器。如果无法中继到exchange，并且您有一台服务器处理所有发送/接收的邮件，则电子邮件将排队。此支持文档解释了此设置：

你只需要一个MX记录，如果你将接收来自该域的邮件太多

我还将为您的域添加反向DNS条目，这将有助于垃圾邮件检测