// The following example codes demonstrate parsing S/MIME email - digital signature and decryption
// To get full sample projects, please download and install EAGetMail on your machine.
// To run it correctly, please change email server, user, password, folder, file name value to yours

Unit Unit1; 

Interface 

Uses 
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
  Dialogs, StdCtrls, EAGetMailObjLib_TLB; 

Type 
  TForm1 = Class(TForm) 
    Button1: TButton; 
    Procedure Button1Click(Sender: TObject); 
  private 
    { Private declarations } 
  public 
    { Public declarations } 
  End; 

Const 
  MailServerPop3 = 0; 
  MailServerImap4 = 1;   CRYPT_MACHINE_KEYSET = 32; 
  CRYPT_USER_KEYSET = 4096; 
  CERT_SYSTEM_STORE_CURRENT_USER = 65536; 
  CERT_SYSTEM_STORE_LOCAL_MACHINE = 131072; 

Var 
  Form1: TForm1; 

Implementation 

{$R *.dfm} 

Procedure TForm1.ParseEmail( fileName: WideString ); 
Var 
  oMail: TMail; 
  i, UBound: Integer; 
  addrs, atts: OleVariant; 
  addr: IMailAddress; 
  att: IAttachment; 
  oCert: TCertificate; 
  oSignerCert: ICertificate; 
Begin 
  oMail := TMail.Create(Application); 
  oMail.LicenseCode := 'TryIt'; 
  oMail.LoadFile(fileName, false); 
  ShowMessage(oMail.Headers.GetValueOfKey('Content-Type')); 
  If oMail.IsEncrypted Then 
    Try 
      // this email is encrypted, decrypt it by default user certificate
      oMail.ConnectTo(oMail.Decrypt(nil)); 
      // You can also use specified certificate like this
      // oCert := TCertificate.Create(Application);
      // oCert.LoadFromFile( 'c:\test.pfx', 'pfxpassword', CRYPT_USER_KEYSET );
      // oMail.Load(oMail.Decrypt(oCert.DefaultInterface).Content);
    Except 
      On ep: Exception Do 
      Begin 
        ShowMessage('Decrypt Error: ' + ep.Message ); 
      End; 
    End; 

  If oMail.IsSigned Then 
     Try 
      // this email is digital signed, verify signature
      oSignerCert := oMail.VerifySignature(); 
      ShowMessage( 'This email contains a valid digital signature.' ); 
      // You can add the certificate to your certificate storage like this
      // oSignerCert.AddToStore(CERT_SYSTEM_STORE_CURRENT_USER,
      // 'addressbook');
      // Then you can use send the encrypted email back to this sender.
    Except 
      On ep: Exception Do 
      Begin 
        ShowMessage('Verify signature Error: ' + ep.Message ); 
      End; 
    End; 


  // Parse email sender
  ShowMessage( 'From: ' + oMail.From.Address ); 

  // Parse email to recipients
  addrs := oMail.ToAddr; 
  UBound := VarArrayHighBound( addrs, 1 ); 
  For i := 0 To UBound Do 
  Begin 
    addr := IDispatch(VarArrayGet(addrs, i)) As IMailAddress; 
    ShowMessage( 'To: ' + addr.Address ); 
  End; 

  // Parse email cc recipients
  addrs := oMail.Cc; 
  UBound := VarArrayHighBound( addrs, 1 ); 
  For i := 0 To UBound Do 
  Begin 
    addr := IDispatch(VarArrayGet(addrs, i)) As IMailAddress; 
    ShowMessage( 'Cc: ' + addr.Address ); 
  End; 

  // Parse email subject
  ShowMessage( 'Subject: ' + oMail.Subject ); 

  // Parse email text body
  ShowMessage( 'Text body: ' + oMail.TextBody ); 

  // Parse email HTML body
  ShowMessage( 'HTML body: ' + oMail.HtmlBody ); 

  // Parse attachment
  atts := oMail.Attachments; 
  UBound := VarArrayHighBound( atts, 1 ); 
  For i := 0 To UBound Do 
  Begin 
    att := IDispatch(VarArrayGet(atts,i)) As IAttachment; 
    ShowMessage( att.Name ); 
  End; 

End; 

Procedure TForm1.Button1Click(Sender: TObject); 
Begin 
  Try 
      ParseEmail('c:\my folder\test.eml'); 
  Except 
    On ep:Exception Do 
      ShowMessage( 'Error: ' + ep.Message ); 
  End; 

End; 

End.