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Delphi DLL Examples

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(Delphi DLL) MailMan GetBadEmailAddrs

Demonstrates how to get the email addresses flagged as invalid during an SMTP send.

Note: An SMTP server can only issue errors for email addresses under it's own domain. For example, if using smtp.gmail.com to send email, the GMail server can only know what emails in the gmail.com domain are invalid. If, for example, the "TO" recipient is "doesNotExist@chilkatsoft.com", then the email would be accepted. If it's not actually a valid email address, it is not flagged as an error during the client-to-SMTP-server conversation. (If the email address turns out to be truly invalid, then a DSN (Delivery Status Notification, or "bounce") email *might* be sent by the final destination mail server to the return address.

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
mailman: HCkMailMan;
success: Boolean;
email: HCkEmail;
badAddrs: HCkStringArray;
numBadAddrs: Integer;
i: Integer;

begin
//  Demonstrates how to get the list of invalid email addresses flagged by the SMTP server
//  at the time of sending (i.e. during the SMTP conversation).

mailman := CkMailMan_Create();

//  Any string argument automatically begins the 30-day trial.

success := CkMailMan_UnlockComponent(mailman,'30-day trial');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

CkMailMan_putSmtpHost(mailman,'outlook.office365.com');
CkMailMan_putSmtpPort(mailman,587);
CkMailMan_putStartTLS(mailman,True);

//  Set the SMTP login/password
CkMailMan_putSmtpUsername(mailman,'OFFICE365-SMTP-LOGIN');
CkMailMan_putSmtpPassword(mailman,'OFFICE365-SMTP-PASSWORD');

//  Create a new email object
email := CkEmail_Create();

CkEmail_putSubject(email,'Testing for Chilkat API...');
CkEmail_putBody(email,'Testing for Chilkat API...');
CkEmail_putFrom(email,'Chilkat Support <my-office365-user@mydomain.com>');
success := CkEmail_AddTo(email,'Chilkat Admin','admin@chilkatsoft.com');
success := CkEmail_AddTo(email,'Non-Existent Recipient 1','nonexist1@something.com');
success := CkEmail_AddTo(email,'Non-Existent Recipient 2','nonexist2@gmail.com');
//  To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

//  Allow SendEmail to succeed even if some recipients are rejected immediately
//  by the SMTP server.
CkMailMan_putAllOrNone(mailman,False);

//  Call SendEmail to connect to the SMTP server and send.
//  The connection (i.e. session) to the SMTP server remains
//  open so that subsequent SendEmail calls may use the
//  same connection.
success := CkMailMan_SendEmail(mailman,email);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

success := CkMailMan_CloseSmtpConnection(mailman);
if (success <> True) then
  begin
    Memo1.Lines.Add('Connection to SMTP server not closed cleanly.');
  end;
Memo1.Lines.Add('Mail Sent!');

//  IMPORTANT:  This example uses the Office365 SMTP server.  However, Office365 does not
//  reject any invalid emails, even for it's own domain.  This is common behavior.
//  The same is true for GMail.  In many cases, the recipient email addresses are silently
//  accepted by the SMTP server, even if known to be invalid.

//  Using GetBadEmailAddrs would only make sense for server that explicilty rejects local recipients
//  known to be invalid.

//  Examine which email addresses were rejected by the SMTP server during the SMTP conversation.
//  (i.e. during the SendEmail)
badAddrs := CkMailMan_GetBadEmailAddrs(mailman);
numBadAddrs := CkStringArray_getCount(badAddrs);
i := 0;
while i < numBadAddrs do
  begin
    Memo1.Lines.Add('Rejected recipient ' + IntToStr(i) + ': ' + CkStringArray__getString(badAddrs,i));
    i := i + 1;
  end;

CkStringArray_Dispose(badAddrs);

CkMailMan_Dispose(mailman);
CkEmail_Dispose(email);

end;

 

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