About the Enterprise Mailbox server is often Spamhaus anti-spam organization interception of the wrong way to share

In fact, in the Enterprise mail platform management process, the enterprise mailbox administrators are often plagued by a variety of mailbox problems, and the biggest trouble in addition to the server planning improper late server maintenance difficulties, but also the most deadly is the most urgent things for the mail administrator, That is, the enterprise mailbox is often blacklisted by some international anti-spam organizations, perhaps, many people will think, if it is listed as a blacklist, then directly to the appeal, release on it, this answer is actually barely can be considered right, but from the appeal to release, in fact, it is also necessary to wait a time, Then there is a large number of users to reflect, I personally think that this is actually a manifestation of the mail platform instability, as an administrator, you must understand the root cause of the blacklist, of course, the most important thing is to plan the Mail platform architecture, Can reasonably plan the system structure and network structure to have a more stable mail platform structure, below, I would like to share a less common typical case.

In the previous period of time, in the processing of some mail technical support work, encountered the enterprise mailbox server is frequently blacklisted by the international anti-Spam Alliance, and the frequency is very high, the basic day at least 3 times, this actually from 3 times the meaning, this is not a simple server failure, It is possible that we have been targeted by the anti-Spam Alliance for the external public email address, so we are 3 times a day, even in the early hours of the anti-Spam alliance to complain? Or do you want to think about where there is a problem? Of course, I believe that occasionally out of the blacklist, the problem after the complaint resolution, it is normal, after all, sometimes anti-spam alliance will also have a miscarriage. And this time the problem, it is obviously not a miscarriage of the oh, so still need to find the root cause.

In this fault, I used one of the simplest ways, and also an empirical way of dealing with such problems before, what is the return value when I reverse telnet to another company's mail server? This return value, of course, refers to when you go to Telnet to the end of the mail server IP, to the end echo your originating connection IP is how much?

In fact, at that time someone raised the question, you go to Telnet to the end of the mail platform is meaningful? Of course, it makes sense, from the perspective of troubleshooting, Exchange Server services are normal, network links, then there will be problems, if you have to implement Exchange experience, you will know that the last step is to port mapping. So let's take a look at the port mapping, and before you ask the network engineer for a mapping, you might as well do one of these things like me.

1. Under the Office network platform, telnet to other mail organizations that support Telnet Echo, to see what address the echo back.

2. Telnet supports telnet echo on the mail gateway or on the Exchange server, mail organization, to see what address the echo back is.

Why do you have to do these 2 steps? If the two echoes are different addresses OK, but if both echo is the Mail gateway address? This is a problem, after all, we release 25 port is generally only for the mail platform, and if the office network arbitrarily a machine telnet other mail organization Mail server, is the Mail gateway address, then what it means, I believe our mail administrator is very clear.

Finally through the network map to see and verify my analysis results, at that time network level in order to simple, directly the entire office network address 25 port map in order to mail Gateway public address, for this, I asked to do a mapping, to ensure that the mail public IP only for the mail gateway, not to be used in other mappings, adjust the map server scope , observed for 1 months, no longer in the anti-Spam Alliance interception problem.

The above is only my analysis of the international anti-Spam Alliance as a blacklist when the column processing method, I hope to have a similar problem of Bo friends to read some help.

This article is from the "Clumsy birds have" blog, make sure to keep this source http://tingdongwang.blog.51cto.com/1056852/1640227

About the Enterprise Mailbox server is often Spamhaus anti-spam organization interception of the wrong way to share