Node.js
Send HTML Email with External CSS as Related Item

Demonstrates how to compose an HTML email with an external CSS file included as a related item and referenced by CID (Content-ID).
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Node.js
NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

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

    // Use your SMTP server hostname.  This example uses office365, but it could be any SMTP server..
    mailman.SmtpHost = "outlook.office365.com";
    mailman.SmtpPort = 587;
    mailman.StartTLS = true;

    // Set the SMTP login/password
    mailman.SmtpUsername = "OFFICE365-SMTP-LOGIN";
    mailman.SmtpPassword = "OFFICE365-SMTP-PASSWORD";

    // Create a new email object
    var email = new chilkat.Email();
    email.Subject = "HTML Email with embedded CSS";
    email.From = "Chilkat Support <my-office365-user@mydomain.com>";
    email.AddTo("Chilkat Support","support@chilkatsoft.com");

    var sbCss = new chilkat.StringBuilder();
    var bCrlf = true;
    sbCss.AppendLine("body {",bCrlf);
    sbCss.AppendLine("    background-color: powderblue;",bCrlf);
    sbCss.AppendLine("}",bCrlf);
    sbCss.AppendLine("h1 {",bCrlf);
    sbCss.AppendLine("    color: blue;",bCrlf);
    sbCss.AppendLine("}",bCrlf);
    sbCss.AppendLine("p {",bCrlf);
    sbCss.AppendLine("    color: red;",bCrlf);
    sbCss.AppendLine("}",bCrlf);

    // It's possible to add a CSS file directly by calling AddRelatedFile.
    // This example will add the CSS from a string.
    var filenameInHtml = "styles.css";
    var contentIdCss = email.AddRelatedString(filenameInHtml,sbCss.GetAsString(),"utf-8");
    if (email.LastMethodSuccess !== true) {
        console.log(email.LastErrorText);
        return;
    }

    // The src attribute for the image tag is set to the contentIdCss:
    var sbHtml = new chilkat.StringBuilder();
    sbHtml.AppendLine("<!DOCTYPE html>",bCrlf);
    sbHtml.AppendLine("<html>",bCrlf);
    sbHtml.AppendLine("<head>",bCrlf);
    sbHtml.AppendLine("  <link rel=\"stylesheet\" href=\"cid:CONTENT_ID_CSS\">",bCrlf);
    sbHtml.AppendLine("</head>",bCrlf);
    sbHtml.AppendLine("<body>",bCrlf);
    sbHtml.AppendLine("",bCrlf);
    sbHtml.AppendLine("<h1>This is a heading</h1>",bCrlf);
    sbHtml.AppendLine("<p>This is a paragraph.</p>",bCrlf);
    sbHtml.AppendLine("",bCrlf);
    sbHtml.AppendLine("</body>",bCrlf);
    sbHtml.AppendLine("</html>",bCrlf);

    var numReplacements = sbHtml.Replace("CONTENT_ID_CSS",contentIdCss);

    email.SetHtmlBody(sbHtml.GetAsString());

    success = mailman.SendEmail(email);
    if (success !== true) {
        console.log(mailman.LastErrorText);
    }
    else {
        console.log("Mail Sent!");
    }


}

chilkatExample();