Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

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Chilkat.Imap imap = new Chilkat.Imap();

bool success;

//  Anything unlocks the component and begins a fully-functional 30-day trial.
success = imap.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

//  Connect to an IMAP server.
success = imap.Connect("mail.chilkatsoft.com");
if (success != true) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

//  Login
success = imap.Login("****","****");
if (success != true) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

//  Select an IMAP mailbox
success = imap.SelectMailbox("Inbox");
if (success != true) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

Chilkat.MessageSet messageSet = null;
//  We can choose to fetch UIDs or sequence numbers.
bool fetchUids;
fetchUids = true;
//  Get the message IDs of all the emails in the mailbox
messageSet = imap.Search("ALL",fetchUids);
if (messageSet == null ) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

//  When downloading headers, each email object contains
//  (obviously) the headers, but the body will be missing.
//  Also, attachments will not be included.  However, it is
//  possible to get information about the attachments
//  as well as the complete size of the email.
Chilkat.EmailBundle bundle = null;
bundle = imap.FetchHeaders(messageSet);
if (bundle == null ) {

    MessageBox.Show(imap.LastErrorText);
    return;
}

//  Loop over the email objects and display information
//  about each:
int i;
for (i = 0; i <= bundle.MessageCount - 1; i++) {
    Chilkat.Email email = null;
    email = bundle.GetEmail(i);

    //  Display the From and Subject
    textBox1.Text += email.From + "\r\n";
    textBox1.Text += email.Subject + "\r\n";

    //  Display the recipients:
    int j;
    string name;
    string addr;
    for (j = 0; j <= email.NumTo - 1; j++) {
        name = email.GetToName(j);
        addr = email.GetToAddr(j);
        textBox1.Text += name + ", " + addr + "\r\n";
    }

    for (j = 0; j <= email.NumCC - 1; j++) {
        name = email.GetCcName(j);
        addr = email.GetCcAddr(j);
        textBox1.Text += name + ", " + addr + "\r\n";
    }

    //  Show the total size of the email, including body and attachments:
    textBox1.Text += email.Size + "\r\n";

    //  When a full email is downloaded, we would use the
    //  email.NumAttachments property in conjunction with the
    //  email.GetMailAttach* methods.
    //  However, when an email object contains only the header,
    //  we need to access the attachment info differently:
    int numAttach;
    numAttach = imap.GetMailNumAttach(email);
    for (j = 0; j <= numAttach - 1; j++) {
        textBox1.Text += imap.GetMailAttachFilename(email,j) + "\r\n";
        int attachSize;
        attachSize = imap.GetMailAttachSize(email,j);
        textBox1.Text += "    size = " + Convert.ToString(attachSize)
             + " bytes" + "\r\n";
    }

    textBox1.Text += "--" + "\r\n";

}

//  Disconnect from the IMAP server.
imap.Disconnect();