(Delphi ActiveX) Send HTML Email with CSS as Related Item using Content-Location

Demonstrates how to compose an HTML email with an external CSS file included as a related item and referenced by Content-Location.

Some email clients display embedded (related) content best using CID's (Content-IDs), whereas other email clients display related content best by Content-Location. The choice you make may depend on the software used by the intended recipient of your email. (Does' the recipient read email on an iPhone? Android? Outlook? GMail? Thunderbird? etc.)

Chilkat for Delphi Downloads

Chilkat ActiveX DLL for Delphi

Chilkat non-ActiveX DLL for Delphi

* The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
mailman: TChilkatMailMan;
email: TChilkatEmail;
sbCss: TChilkatStringBuilder;
bCrlf: Integer;
filenameInHtml: WideString;
sbHtml: TChilkatStringBuilder;
success: Integer;

begin
// 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.
mailman := TChilkatMailMan.Create(Self);

// 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 := 1;

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

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

sbCss := TChilkatStringBuilder.Create(Self);
bCrlf := 1;
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);

// The filenameInHtml is what should exists within the HTML (in the href atribute)
filenameInHtml := 'styles.css';
// Call AddRelatedString2 to use Content-Location.
email.AddRelatedString2(filenameInHtml,sbCss.GetAsString(),'utf-8');

sbHtml := TChilkatStringBuilder.Create(Self);
sbHtml.AppendLine('<!DOCTYPE html>',bCrlf);
sbHtml.AppendLine('<html>',bCrlf);
sbHtml.AppendLine('<head>',bCrlf);
sbHtml.AppendLine('  <link rel="stylesheet" href="styles.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);

email.SetHtmlBody(sbHtml.GetAsString());

success := mailman.SendEmail(email.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
  end
else
  begin
    Memo1.Lines.Add('Mail Sent!');
  end;
end;