Explanation of the reason of sending and receiving and the solution of U-mail mail relay

Mail in business dealings play an important role in the exchange of information, if the transmission is blocked, will lead to communication is not smooth; maybe 35 mail delivery you do not realize its importance, but if the long-term need to maintain communication with customers, you need to ensure its consistent stability, it is very testing the performance of the relevant software platform is good. An excellent tool software that can understand the message transmission mechanism, carefully consider each link, evaluate the cause of possible errors, and do a good job of preventive measures. Below we will invite the industry outstanding service Provider U-mail Isao to explain the mail transceiver mechanism, may cause the transmission is not smooth the reason and the solution.

We came to the point where e-mail was going through the process:

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Isao that the e-mail "through" the road prone to problems can be divided into three blocks:

1. Sender DNS Query area (problem index four stars), common DNS resolution is incorrect or DNS is hijacked, such as using the telco's DNS.

2. The Internet transmission area (the problem index five stars), such as telecommunications unicom interconnection, such as sending mail to foreign countries due to the different Internet environment can not be received.

3. The recipient receives the mail area (the problem index is a star), such as the inability to connect to the server due to personal network problems.

Now that you have found the problem, you can find a solution to it:

A. Choose to set up a stable DNS, such as Google's DNS or more well-known, authoritative, professional network operators to provide DNS, because of the well-known reasons, the domestic blocked Google, then we recommend that you use the DNS of domestic operators, must pay attention to more identification and repeated verification, and now the information is so developed, The choice can be determined by searching the Internet and testing it yourself.

B. For the "Internet Transmission Mail" link in the high-problem area, we recommend that you choose a good quality mail relay service provider, like U-mail is very good, dare to make public promise: Even if the sender IP in the other party "blacklist", the message arrives without error. Let's see how U-mail solves this problem by trying to log in to the system management background of the U-mail mail server, which is clearly seen in the following dialog boxes:

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There are three kinds of resolution mechanism corresponding to the status of the message may appear, if it can be directly sent unimpeded, then direct; otherwise, the relay server is enabled to send. In general, most of the mail can be sent directly, very few need to relay the server, U-mail will also be considerate. For a single domain need to relay, is the direct relay settings, but also the need to fail and then turn the trunk? And look at

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It can be seen that in a single domain, it is still possible to set the following in a specific step, in detail, such as:

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In the relay this link, u-mail to ensure the communication, can be described as a painful loss, in the major cities around the world, business activity centers are extravagantly, under the mail relay server, composed of a relay cloud network, so that mail delivery, the ability to select the most optimized route delivery to the recipient server.

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C. As to the recipient network caused by the problem, it is not you can around, you can do is to do their own responsibility, every opportunity, remind the other side of the client set the server's intranet IP.

Explanation of the reason of sending and receiving and the solution of U-mail mail relay