how mail relay resolves mail return issues

E-mail depends on the network, the so-called mail relay ultimately need to solve the problem, is the network problem. The network is normal, of course, there is no need for mail relay service. But China is a relatively complex network of countries, there is telecommunications and unicom, their interconnection between the problem, is an eternal problem, unless the day suddenly merged. There is also the network export needs to go through the national firewall GFW.

In the process of sending and receiving mail, what will happen to telecom and Unicom? will appear, you are opposite me, but I do not find you. For example, the following illustration may be the difference between upstairs and downstairs, but a use of the telecommunications network, a use of Unicom's network, but two can not send mail. Then the user may ask, for what? We are all able to surf the Internet properly!!!

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Of course, the above is only a network interconnection problem, and now the enterprise generally choose double line, can deal with this problem, but the cost above the relative also increased, need two lines of cost.

Also, my IP into the CBL anti-spam blacklist, the complaint to delete CBL. But has not been successful, online check let a change IP can. What to do with this. General mail export IP into the Rbl,pbl,spamhaus related anti-spam list, is more normal, and some foreign anti-spam Alliance is directly add China IP segment directly to the blacklist, and not only the IP reputation will have problems, there will always be the need to reverse the resolution of the problem, In the domestic non-pan-regional operators, do not give users to do reverse resolution. But in the case of the request of the recipient to reverse the resolution, it is a very tangled problem.

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For the international export line problem, is also a lot of problems in the high-fat area, and there is a high wall to keep us in. Citing the data on the Internet, China's per capita international Main Line broadband is 2.5K .... This is directly caused by the sending of mail to foreign countries, not successful more. International exports of broadband directly affect the delivery of international mail. Of course, there are no problems with free use, such as the deployment of servers all over the world. This discussion is in the case of self-built.

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In response to the above problems, U-mail mail relay service has been generated, first invested a lot of money and manpower, set up servers around the world, and in accordance with national conditions, the use of intelligent resolution plus multi-line < telecommunications, Unicom > Multipoint distribution, To ensure that users of different lines and regions can be a normal and fast connection relay server, for the situation abroad, each server has set the standard reverse resolution and domain name SPF record, and strive to ensure that each user's mail can be normal delivery to the recipient's server above. Of course, the specific technical issues are not just these words can be expressed clearly, follow-up will continue to update, welcome to focus on the updated content.

U-mail Mail Relay Service configuration is also very simple, with the known mail system u-mail,coremail,exchange,turbomail,winmail and so on normal settings, set up immediately after the effective. And now has opened the mail relay Platform query service. Whether it is delivered to the user's server, why there is no delivery is clearly displayed, even if you are not a technology, you can see, as you see your own mail. If you have just set up, check whether it takes effect, you can send a message directly, and then the mail relay platform can directly see the relevant mail status. Such as:

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This management platform uses humanized design, simple query, no entry technical requirements, direct use. Can quickly query the success of each delivery report, the number of messages sent each day, the number of success, such as a variety of data, one eye understanding.

Well, whether good and bad, whether human, product quality and suitability, only after the use can be judged.

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how mail relay resolves mail return issues