Pascal (Lazarus/Delphi)
Mailgun Send Email using MIME

Send an email using MIME. This allows for the Chilkat email object to be used to construct the email. Then it can be sent using Mailgun.
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Pascal (Lazarus/Delphi)
program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.HttpResponse,
  Chilkat.Email,
  Chilkat.StringBuilder,
  Chilkat.JsonObject,
  Chilkat.HttpRequest;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  email: TEmail;
  contentType: string;
  html: string;
  http: THttp;
  req: THttpRequest;
  resp: THttpResponse;
  sbResponseBody: TStringBuilder;
  jResp: TJsonObject;
  respStatusCode: Integer;
  id: string;
  message: string;

begin
  success := False;

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

  //  We're going to create an email that contains an .zip attachment,
  //  and also both plain-text and HTML alternative bodies.
  //  The HTML body will include an image.

  email := TEmail.Create;

  //  Adding attachments, HTML/plain-text bodies, etc can be done
  //  in any order:

  //  Add an attachment
  contentType := email.AddFileAttachment('qa_data/hamlet.zip');
  if (email.LastMethodSuccess = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  //  Add some headers:
  email.Subject := 'This is a complex email';
  //  Please change this email address before testing.
  success := email.AddTo('Joe Example','joe@example.com');
  email.From := 'Your Name <mailgun@YOUR_DOMAIN_NAME>';

  //  Add a plain-text body:
  email.AddPlainTextAlternativeBody('This is the plain-text body');

  //  Add an image that will be embedded in the HTML body.
  success := email.AddRelatedFile2('qa_data/jpg/starfish.jpg','starfish.jpg');
  if (success = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  //  Add an HTML body:

  html := '<html><body><b>This is the HTML body</b><br><img src="starfish.jpg"></body></html>';

  email.AddHtmlAlternativeBody(html);

  //  ------------------------------------------------------------------------
  //  Send the above email using Mailgun

  http := THttp.Create;

  //  Implements the following CURL command:

  http.Login := 'api';
  http.Password := 'sending_api_key';  //  Replace with your actual sending API key.

  req := THttpRequest.Create;
  req.HttpVerb := 'POST';
  req.Path := '/v3/YOUR_DOMAIN_NAME/messages.mime';
  req.ContentType := 'multipart/form-data';

  req.AddParam('from','Your Name <mailgun@YOUR_DOMAIN_NAME>');
  req.AddParam('to','Joe Example <joe@example.com>');
  req.AddStringForUpload2('message','message.eml',email.GetMime(),'utf-8','application/octet-stream');

  resp := THttpResponse.Create;
  success := http.HttpSReq('api.mailgun.net',443,True,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  sbResponseBody := TStringBuilder.Create;
  resp.GetBodySb(sbResponseBody);
  jResp := TJsonObject.Create;
  jResp.LoadSb(sbResponseBody);
  jResp.EmitCompact := False;

  WriteLn('Response Body:');
  WriteLn(jResp.Emit());

  respStatusCode := resp.StatusCode;
  WriteLn('Response Status Code = ' + respStatusCode);
  if (respStatusCode >= 400) then
    begin
      WriteLn('Response Header:');
      WriteLn(resp.Header);
      WriteLn('Failed.');
      Exit;
    end;

  //  Sample JSON response:
  //  (Sample code for parsing the JSON response is shown below)

  //  {
  //    "id": "<20210429234809.1.2D550E1C94D3D98F@sandbox0e542e4c577f4bbb98c8bf6b6bca727b.mailgun.org>",
  //    "message": "Queued. Thank you."
  //  }

  //  Sample code for parsing the JSON response...
  //  Use the following online tool to generate parsing code from sample JSON:
  //  Generate Parsing Code from JSON

  id := jResp.StringOf('id');
  message := jResp.StringOf('message');


  email.Free;
  http.Free;
  req.Free;
  resp.Free;
  sbResponseBody.Free;
  jResp.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.