Delphi DLL

Verify Connectivity to the SMTP Server

Demonstrates the Chilkat MailMan.VerifySmtpConnection method, which tests whether a TCP/IP connection can be established with the configured SMTP server. It verifies connectivity only — it does not authenticate. This example configures the SMTP host and checks whether it can be reached.

Background: When a send fails, it helps to know where it broke. VerifySmtpConnection isolates the first hop — can the client even reach the server on the configured host and port, and complete the TLS handshake? A failure here points at networking, firewall, DNS, port, or certificate issues rather than credentials. Once connectivity is confirmed, VerifySmtpLogin tests the authentication step.

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Delphi DLL

var
mailman: HCkMailMan;
connected: Boolean;

begin
//  Demonstrates the MailMan.VerifySmtpConnection method, which tests whether a TCP/IP
//  connection can be established with the configured SMTP server.  It verifies connectivity
//  only (it does not authenticate).

mailman := CkMailMan_Create();

//  Configure the SMTP server connection.
CkMailMan_putSmtpHost(mailman,'smtp.example.com');
CkMailMan_putSmtpPort(mailman,465);
CkMailMan_putSmtpSsl(mailman,True);

//  Test connectivity to the SMTP server.
connected := CkMailMan_VerifySmtpConnection(mailman);

if (connected = True) then
  begin
    Memo1.Lines.Add('Successfully connected to the SMTP server.');
  end
else
  begin
    Memo1.Lines.Add('Could not connect to the SMTP server.');
  end;

CkMailMan_Dispose(mailman);