配置示例如下：
<appSettings>
<add key="EmailFrom" value="[email protected]"/>
<add key="EmailTo" value="[email protected]"/>
<add key="SmtpServer" value="mail.xaut.edu.cn"/>
<add key="Port" value="25"/>
<add key="MailUser" value="emanxaut"/>
<add key="MailPassword" value="xxxxx"/>
<add key="NeedCredential" value="true"/>
<add key="EnableSSL" value="false"/>
</appSettings>
SmtpServer错误：
Unable to connect to the Remote Server
Port错误：
Unable to connect to the Remote Server
MailPassword错误：
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication required.
MailUser错误：
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication required.
EnableSSL错误：
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. w12sm2503911tib.10
EmailTo错误：
EmailFrom错误：
NeedCredential错误：
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication required.
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