exchange server 匿名访问问题?

公司用的邮件系统是EXCHANGE 2000,前两天我在把SMTP中的 ASSESS里的匿名访问取消后发现所有的外来邮件都不能收到,但是如果不取消又有大量的垃圾邮件,想请问一下,如果取消匿名访问是不是还有什么别的设置,请指教,谢谢!!
[117 byte] By [sunny78101213] at [2008-5-21]
# 1
you must enable anonymous access on SMTP virtur server if you need to receive messages addressed to you domain from the Internet.

Consider using spam software to control spams.
signup0702-signup at 2007-10-22 > top of Msdn China Tech,企业开发,Exchange Server...