(Continuation from yesterday)

Currently, my home mail server is still "unbelievable" in the other e-mail server.

Though trying variously while changing the setting, basically computers are stupid. If I set a different parameter, computers will only answer "I can not authenticate you". Of course, the computer will not explain the reasons.

For example, if there are nine items and three patterns for the setting, 19683 times trials are needed in order to be able to reach the correct answer.

If there are samples on the Internet, it is good. However, I cannot find the samples quite easily.

This is natural.

The thoughtless sample disclosure will give server attackers hints of huge attacks.

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I continue to be told from the other mail server "I cannot believe you"

To be honest, my heart is likely to break.

It is not only the human world that "being unbelievable" is "hard".