Using SmtpSendRawCommand to Change Password

Demonstrates how to use the SmtpSendRawCommand method to change the SMTP user account's password for an SMTP server that supports the non-standard CPWD command.

Note: The SmtpSendRawCommand method is not yet released. To get a pre-release, send email to support@chilkatsoft.com.

Download: Chilkat .NET Assemblies

//  The mailman object is used for sending and receiving email.
Chilkat.MailMan mailman = new Chilkat.MailMan();

//  Any string argument automatically begins the 30-day trial.
bool success;
success = mailman.UnlockComponent("30-day trial");
if (success != true) {
    textBox1.Text += mailman.LastErrorText + "\r\n";
    return;
}

//  Set the SMTP server.
mailman.SmtpHost = "smtp.chilkatsoft.com";

//  Set the SMTP login/password (if required)
mailman.SmtpUsername = "myUsername";
mailman.SmtpPassword = "myPassword";

//  Connect and authenticate:
success = mailman.OpenSmtpConnection();
if (success != true) {
    textBox1.Text += mailman.LastErrorText + "\r\n";
    return;
}

string strCharset;
strCharset = "ansi";

Chilkat.bool bEncodeBase64;

//  Send the CPWD command and get the response.
//  Do not include a trailing CRLF (carriage-return line-feed) in the command string.

string strResponse;

bEncodeBase64 = false;
strResponse = mailman.SmtpSendRawCommand("CPWD",strCharset,bEncodeBase64);
if (strResponse == null ) {
    textBox1.Text += mailman.LastErrorText + "\r\n";
    return;
}

//  Expecting a 334 response...
if (mailman.LastSmtpStatus != 334) {
    textBox1.Text += strResponse + "\r\n";
    return;
}

//  Now send the existing login/password, base64-encoded:
bEncodeBase64 = true;

//  Send the existing login:
strResponse = mailman.SmtpSendRawCommand("mySmtpLogin",strCharset,bEncodeBase64);
if (strResponse == null ) {
    textBox1.Text += mailman.LastErrorText + "\r\n";
    return;
}

//  Expecting a 334 response...
if (mailman.LastSmtpStatus != 334) {
    textBox1.Text += strResponse + "\r\n";
    return;
}

//  Send the existing password:
strResponse = mailman.SmtpSendRawCommand("mySmtpPassword",strCharset,bEncodeBase64);
if (strResponse == null ) {
    textBox1.Text += mailman.LastErrorText + "\r\n";
    return;
}

//  Expecting a 334 response...
if (mailman.LastSmtpStatus != 334) {
    textBox1.Text += strResponse + "\r\n";
    return;
}

//  Send the new password:
strResponse = mailman.SmtpSendRawCommand("myNewSmtpPassword",strCharset,bEncodeBase64);
if (strResponse == null ) {
    textBox1.Text += mailman.LastErrorText + "\r\n";
    return;
}

//  Expecting a 250 response...
if (mailman.LastSmtpStatus != 250) {
    textBox1.Text += strResponse + "\r\n";
    return;
}

MessageBox.Show("SMTP password changed!");

success = mailman.CloseSmtpConnection();
if (success != true) {
    MessageBox.Show("Connection to SMTP server not closed cleanly.");
}