高效的Esmtp,带验证，用Socket编写

}

catch

{

return false;

}

priority = "Normal";

//subject = "//";

//smtpCodeAdd();

return true;

}

private string Base64Encode(string str)

{

byte[] barray;

barray=Encoding.Default.GetBytes(str);

return Convert.ToBase64String(barray);

}

private void smtpCodeAdd()

{

rightCodeHT.Add("220","");

rightCodeHT.Add("250","");

rightCodeHT.Add("251","");

rightCodeHT.Add("354","");

rightCodeHT.Add("221","");

rightCodeHT.Add("334","");

rightCodeHT.Add("235","");

}

private bool sendCommand(string str)

{

byte[] writeBuffer;

writeBuffer = Encoding.Default.GetBytes(str);

try

{

networkStm.Write(writeBuffer, 0, writeBuffer.Length);

}

catch