I want to log the SMTP protocol of System.Net.Mail.SmtpClient

as System.Net.Mail.SmtpClient does not provide any mean of doing so, I looked for a way to log the underlying System.Net.Sockets requests and found this stackoverflow answer which gives a way of doing so by inserting the following directives in the .config file of the application.

<system.diagnostics>
  <sources>
    <source name="System.Net">
      <listeners>
        <add name="TraceFile"/>
      </listeners>
    </source>      
    <source name="System.Net.Sockets">
      <listeners>
        <add name="TraceFile"/>
      </listeners>
    </source>      
  </sources>
  <sharedListeners>
    <add
      name="TraceFile"
      type="System.Diagnostics.TextWriterTraceListener"
      initializeData="trace.log"
    />
  </sharedListeners>
  <switches>
    <add name="System.Net" value="Verbose"/>
    <add name="System.Net.Sockets" value="Verbose"/>
  </switches>
  <trace autoflush="true" />
</system.diagnostics>

unfortunately, as I don’t have the opportunity to modify powershell.exe.config, I looked for a way of starting the trace on the fly in my script and found this stackoverflow answer which gives a way,

$id = [Environment]::TickCount
$fileName = "${PSScriptRoot}Powershell.log.${id}.txt"
$listener1 = [System.Diagnostics.TextWriterTraceListener]::New($fileName, "text_listener")
$listener2 = [System.Diagnostics.ConsoleTraceListener]::New()
$listener2.Name = "console_listener"

[System.Diagnostics.Trace]::AutoFlush = $true
[System.Diagnostics.Trace]::Listeners.Add($listener1) | out-null
[System.Diagnostics.Trace]::Listeners.Add($listener2) | out-null

# Use reflection to enable and hook up the TraceSource
$logging = [System.Net.Sockets.Socket].Assembly.GetType("System.Net.Logging")
$flags = [System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Static
$logging.GetField("s_LoggingEnabled", $flags).SetValue($null, $true)
$webTracing = $logging.GetProperty("Web", $flags)
$webTraceSource = [System.Diagnostics.Tracesource]$webTracing.GetValue($null, $null);
$webTraceSource.Switch.Level = [System.Diagnostics.SourceLevels]::Information
$webTracesource.Listeners.Add($listener1) | out-null
$webTracesource.Listeners.Add($listener2) | out-null

[System.Diagnostics.Trace]::TraceInformation("About to do net stuff")
[System.Net.FtpWebRequest]::Create("ftp://www.google.com") | out-null
[System.Diagnostics.Trace]::TraceInformation("Finished doing net stuff")

#get rid of the listeners
[System.Diagnostics.Trace]::Listeners.Clear()
$webTraceSource.Listeners.Clear()
$listener1.Dispose()
$listener2.Dispose()

but I am not able to adapt it to my needs.

I tried to replace Web by Sockets in

$webTracing = $logging.GetProperty("Web", $flags)

and do some system.net.mail stuff in place of

[System.Net.FtpWebRequest]::Create("ftp://www.google.com") | out-null

but with no success.

can you teach me how to adapt the above example to make it start traces as described in the XML .config?