PureBasic

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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IncludeFile "CkMailMan.pb"

Procedure ChilkatExample()

    ;  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.i = CkMailMan::ckCreate()
    If mailman.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ;  Configure the SMTP server connection.
    CkMailMan::setCkSmtpHost(mailman, "smtp.example.com")
    CkMailMan::setCkSmtpPort(mailman, 465)
    CkMailMan::setCkSmtpSsl(mailman, 1)

    ;  Test connectivity to the SMTP server.
    connected.i = CkMailMan::ckVerifySmtpConnection(mailman)

    If connected = 1
        Debug "Successfully connected to the SMTP server."
    Else
        Debug "Could not connect to the SMTP server."
    EndIf



    CkMailMan::ckDispose(mailman)


    ProcedureReturn
EndProcedure