SmtpClient class not picking up default parameters from Web.Config file

问题

config file :

<system.net>
<mailSettings>
<smtp from="YYYYY@xxxxxx.com">
<network
host="mail.xxxxxx.com"
port="25"
password="password"
userName="user@xxxxxx.com"
defaultCredentials="false"
/>
</smtp>
</mailSettings>
</system.net>

I've already tried defaultCredentials="true" but i recieved following message:

System.FormatException: Smtp server returned an invalid response.

how to fix the problem?

回答1:

Set the deliveryMethod property on the smtp element to 'network'.

回答2:

sorry, had the web.config from the Views folder in ASP.NET MVC open, not the one in the application root - DOH!!!!!

Working fine now :))

回答3:

Where have you placed these elements inside your web.config? They should look like this:

<configuration>
  <system.net>
    <mailSettings>
      <smtp from="YYYYY@xxxxxx.com">
        <network host="mail.xxxxxx.com" port="25" password="password" userName="user@xxxxxx.com" defaultCredentials="false"/>
      </smtp>
    </mailSettings>
  </system.net>
<configuration>

But based on the exception you're getting it sounds like the config is working but your message is improperly formatted. What does your MailMessage look like? What are you passing as your From, Email, Subject and Body?

来源：https://stackoverflow.com/questions/329411/smtpclient-class-not-picking-up-default-parameters-from-web-config-file