Shulou(Shulou.com)06/01 Report--

If the sending of mail is likened to a "customs clearance", then a service provider is the "guardian" of a dangerous pass. We can think of "mail" as the sender who holds the "document", then the issuer of this "customs clearance document" is to the mail service operator, and the mail from the sender to the recipient is equivalent to going through two gateways, and there is still a long way between the two gateways, so there are likely to be many emergencies:

1. The sender's service operator qualification is too poor, or to put it popularly, DNS is unstable, not well-known operators such as Google, Telecom, but unknown people in the e-mail world, so the "customs clearance documents" held by the mail lack authority and persuasion.

two。 The sender's IP is not set up for reverse parsing, or it is included in the dynamic IP pool. As soon as the gatekeeper sees the email that comes to "customs clearance", it is unexpectedly a loafer who looks like a wretched and indecent "boy". He suddenly feels disgusted, thinking that you must have ulterior motives.

3. There is also regional discrimination in sending e-mail, just as some forum posts discriminate against people from a big province in the Central Plains. When sending e-mail, the gatekeeper comes from "from china", a country known for its rampant spam, and those anti-spam alliances immediately burst into excitement: what is all this, is it not fraudulent mail again? Refuse indiscriminately.

4. There are problems in international exports, and the failure rate of overseas TCP connections is high. Figuratively speaking, when the mail excitedly comes to the gate and finds that the sign of the pass is unrecognizable, so the mail goes around, always unable to connect and can not find the suitable exit.

5.GFW found an anomaly in email monitoring: when the email came to the gate, he found an arrogant prosecutor around the gatekeeper. TA was holding a "ruler" and various recording instruments, measuring the height and weight of "mail", testing the accent of "mail", and censoring the three generations of "mail" ancestors. Over and over again, it not only delayed the itinerary of the mail, but even found that something was wrong, and immediately typed it back.

6. The network highway malfunctioned: when the sender finally got out of the customs, he found that he had walked on a potholed road and fell into that pothole inadvertently, which no one knew yet.

You see, the road to customs clearance is very difficult, so you need the U-Mail mail relay service. Give the mail to U-Mail, and it will:

1. Arrange the optimal delivery path

In other words, U-Mail designs an optimal delivery path for your mail. U-Mail is like Avalokitesvara. Each arm is a path. Once it finds that one path is blocked, it quickly switches to another path. No matter whether you are connected from China Telecom or China Unicom, as long as you use U-Mail mail relay, you are on a broad road paved by U-Mail.

two。 Encrypt the whole process to ensure security

When your email is running on the U-Mail customs road, U-Mail uses 128bit SSL encrypted transmission, and the default SMTP server uses TLS encrypted transmission. The image analogy is that a high fence has been erected on both sides of the highway, and the outside peeper can't do it at all.

3. Reverse parsing of IP based on RFC standard

U-Mail mail relay uses telecom, Unicom and overseas servers to set correct IP reverse parsing (PTR) and SMTP session HELO parameters in accordance with RFC standards, which can provide enterprise users with the latest SPF records to solve the problem of mail counterfeiting. The popular saying is that every e-mail has a "customs clearance document" issued and guaranteed by U-Mail, which makes the "customs keeper" feel at ease to pass it.

4. Automatic resend, intelligent letter return

The U-Mail mail relay will deliver it for you many times, and even if it doesn't pass, it will tell you clearly that the email has been rejected according to your working language, so that you can take other measures to remedy it.

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