Exchange 删除对 SMTP 的支持吗？
我想通过使用 telnet 到端口 25 来通过 Exchange 发送电子邮件。直到两周前我还可以这样做，但现在 Microsoft 的“安全修复”消除了这种可能性。
当我尝试时，我收到以下消息：
421 4.3.2 服务不可用，正在关闭传输通道
我该怎么办？
I want to send email with Exchange by using telnet to port 25. Until two week ago I was able to, but now a "security fix" from Microsoft has removed this possibility.
When I try, I get this message:
421 4.3.2 Service not available, closing transmission channel
What can I do?
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我使用服务（消息实验室（ML））来过滤掉所有垃圾邮件。 我们获得了新的互联网连接，在将 ML 的入站/出站服务重新配置到新 IP 的过程中，我遇到了错误。 因此，我通过远程登录到端口 25 上的 IP 从外部对其进行了测试，并收到“421 4.3.2 服务不可用，关闭传输通道”错误。 我一开始没有意识到它失败的原因是我在 2007 边缘服务器接收连接器（用于 ML 服务器）上设置了特定的 IP 分组。 所以，我添加了我的局域网网络和 另外，我正在测试的外部主机的另一个IP，你瞧，我可以从两者进行连接。
我认为 ML 发生的情况是，他们测试连接的服务器所在的地址被排除在边缘服务器之外。
因此，我删除了测试 IP，并在边缘服务器上创建了一个新的临时接收连接器，接受来自所有地址 (0.0.0.0 - 255.255.255.255) 的连接。 然后我再次向 ML 提交了更改，你猜怎么着……这次他们接受了。 现在，我将简单地移除测试接收连接器，一切都应该是金色的。
I use a service (Message Labs (ML)) to filter out all the spam. We got a new internet connection and in the process of re-configuring ML's inbound/outbound services to the new IP, I got an error. So, I tested it from external by telneting to the IP on port 25 and got the "421 4.3.2 Service not available, closing transmission channel" error. What I didn't realize at first was that the reason it failed was because I had set a specific grouping of IPs on the 2007 edge server receive connector (for the ML servers). So, I added my lan network & additionally another IP for the external host I was testing from and low and behold, I could connect from both.
What I figured was happening with ML was that their server that was testing the connectivity was on an address that was excluded from the edge server.
So, I removed my testing IPs and created a new, temporary, receive connector on the edge server, accepting from all addresses (0.0.0.0 - 255.255.255.255). I then submitted the change to ML again and guess what...this time they accepted it. Now, I'll simply remove the test receive connector and everything should be golden.
SMTP 是用于接收来自世界其他地方的电子邮件的协议，因此我怀疑 Microsoft 是否已放弃该协议。 您的服务器上一定存在其他配置错误。
尝试仔细检查您的中继设置和交换服务器上的事件日志。
SMTP is the protocol that is used to receive email from the rest of the world so I doubt that Microsoft has dropped that. There must be some other misconfiguration on your server.
Try double-checking your relay-settings and the event-log on your exchange-server.
经过 5 年多的完美工作后，2010 年的 EDG 服务器突然停止接受并显示“421 4.3.2 服务不可用”。 SmtpReceive 日志 (
Get-TransportServer | select ReceiveProtocolLogPath) 确认确实是边缘服务器生成了此错误。EDGE 服务器在单个 NIC 上有两个 IP 地址。 经过以下步骤后，一切再次正常工作：
默认内部接收连接器上的第二个 IP 地址，允许接收所有可用 IPv4 地址上的邮件。注意：此设置不是 DMZ 的安全最佳实践。 最好使用两个 NIC，每个 NIC 的一条线路位于不同的区域。
After more than 5 years of flawless working, the 2010 EDG server suddenly stopped accepting with "421 4.3.2 Service not available". The SmtpReceive log (
Get-TransportServer | select ReceiveProtocolLogPath) confirmed that it was indeed the edge server generating this error.The EDGE server had two ip-addresses on a single NIC. After the following steps all worked fine again:
Default internal receive connectorallow to receive mail on all available IPv4 addresses.Notice: this setup is not a security best practice for a DMZ. Better to use two NICs each with a leg in a different zone.
我在网站上找到了答案：
http://forums.microsoft .com/TechNet/ShowPost.aspx?PostID=2900802&SiteID=17
感谢您的帮助！
基本上，此功能在默认情况下已被删除，可以通过临时配置来恢复 - 但不能保证进一步的“更新”会再次破坏系统。 谢谢，微软。
I found the answer at website:
http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=2900802&SiteID=17
Thanks for your help!
Basically, this functionality was removed by default and it could be restored by means of an ad hoc configuration - but with no guarrantee that further "updates" break the system again. Thanks, Microsoft.