Error message when sending an email using system. net. Mail

 

Error message when sending an email using system. net. Mail

The configuration example is as follows:

<Deleetask>

<Add key = "emailfrom" value = "emanxaut@xaut.edu.cn"/>
<Add key = "emailto" value = "eman@xaut.edu.cn"/>
<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>

Configuration error and prompt information:

Smtpserver error:

Unable to connect to the remote server

Port error:

Unable to connect to the remote server

Mailpassword error:

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 authentication required.

Mailuser error:

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 authentication required.

Enablessl error:

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 error:

You can still send the message successfully without any error message.

Emailfrom error:

You can still send the message successfully without any error message.

Needcredential error:

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 authentication required.