/// <summary>
/// Authenticates a socket client using the specified Username and Password.
/// </summary>
/// <returns>True if the client was successfully authenticated. False otherwise.</returns>
private async Task <bool> AuthenticateAsync()
{
if (!IsConnected)
{
return(false);
}
// get the type of auth
SmtpResponse response = await Socket.Send("EHLO " + Server);
if (response.ContainsMessage("STARTTLS"))
{
SmtpResponse responseSSL = await Socket.Send("STARTTLS");
if (responseSSL.ContainsStatus(SmtpCode.ServiceReady))
{
await Socket.UpgradeToSslAsync();
return(await AuthenticateAsync());
}
}
if (response.ContainsMessage("AUTH"))
{
if (response.ContainsMessage("LOGIN"))
{
IsAuthenticated = await AuthenticateByLoginAsync();
}
else if (response.ContainsMessage("PLAIN"))
{
IsAuthenticated = await AuthenticateByPlainAsync();
}
}
else
{
await Socket.Send("EHLO " + Server);
IsAuthenticated = true;
}
return(IsAuthenticated);
}
