AspEmail through the MDaemon SMTP letter-recipient unknow processing method

Using AspEmail to MDaemon SMTP letter-recipient unknow processing method
To the server with a mail server, with the MDaemon 7.2.5, because this version has a free registration machine.

At first, I used the original for Cdont wrote the AspEmail of the Web program in any case can not through the current MDaemon letter, prompted error messages 550***@***.com recipient Unknow

Then, by querying the data and comparing the program that you wrote, the value of the from attribute in AspEmail must be the mail address registered in the mail server. Further, I found that as long as you set the From property to a legitimate e-mail address that is already registered in the mail server, the message can be successfully sent through AspEmail, even if you do not use the username and password parameters, that is, MDaemon only for email address verification, not for password verification.

My test environment: Advanced Server+iis+aspemail+mdaemon 7.2.5

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