ASP.net SMTP Mail though Proxy

How to setup SMTPClient in ASP.net with C# to send email with provided proxy address ? or sending by detecting the system default proxy

I used the the following code in web.config but didnt work

<system.net>
    <defaultProxy enabled="true">
      <proxy bypassonlocal="False" proxyaddress="http://192.168.101.3:8080/" />
    </defaultProxy>
  </system.net>

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Answers:

Method 1

Method 2

Answers:

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Method 1

You can’t send SMTP email through an HTTP proxy server.

Speak to the person administering your Internet gateway/firewall to ask what host they want you to direct outbound email to.

Method 2

Based on this article, you simply have to declare your proxy configuration into your Web.config and try to change the port:

If you are still having problems them try changing port number to 587

Edited my answer after your edit.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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