(Node.js) Imap.GetMailSize vs Email.Size

Shows how to get the total size of an email, as well as the sizes of the attachments. This can be done when either full-emails or headers-only are downloaded.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var imap = new chilkat.Imap();

    // Connect to an IMAP server.
    // Use TLS
    imap.Ssl = true;
    imap.Port = 993;
    var success = imap.Connect("imap.someMailServer.com");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

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

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

    // messageSet: MessageSet
    var messageSet;
    // We can choose to fetch UIDs or sequence numbers.
    var fetchUids = true;
    // Get the message IDs of all the emails in the mailbox
    messageSet = imap.Search("ALL",fetchUids);
    if (imap.LastMethodSuccess == false) {
        console.log(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.
    // bundle: EmailBundle
    var bundle;
    bundle = imap.FetchHeaders(messageSet);
    if (imap.LastMethodSuccess == false) {

        console.log(imap.LastErrorText);
        return;
    }

    // Loop over the email objects and display information
    // about each:
    var i = 0;
    var numEmails = bundle.MessageCount;
    while (i < numEmails) {
        // email: Email
        var email;
        email = bundle.GetEmail(i);

        // Display the From and Subject
        console.log(email.From);
        console.log(email.Subject);

        // Display the recipients:
        var j;
        for (j = 0; j <= email.NumTo - 1; j++) {
            console.log(email.GetToName(j) + ", " + email.GetToAddr(j));
        }

        for (j = 0; j <= email.NumCC - 1; j++) {
            console.log(email.GetCcName(j) + ", " + email.GetCcAddr(j));
        }

        // Show the total size of the email, including body and attachments:
        console.log(email.Size);

        // 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:
        var numAttach = imap.GetMailNumAttach(email);
        for (j = 0; j <= numAttach - 1; j++) {
            console.log(imap.GetMailAttachFilename(email,j));
            var attachSize = imap.GetMailAttachSize(email,j);
            console.log("    size = " + attachSize + " bytes");
        }

        console.log("--");

        i = i+1;
    }

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


}

chilkatExample();