PureBasic

Send an SMTP NOOP Command

Demonstrates the Chilkat MailMan.SmtpNoop method, which sends an SMTP NOOP command to the server. NOOP does nothing except elicit a positive response, which is useful for keeping a connection alive or verifying it is still responsive. This example opens an SMTP connection, sends a NOOP, and closes.

Background: When holding an SMTP connection open across many sends (see OpenSmtpConnection), an idle stretch can cause the server to time out and drop the socket. A periodic NOOP keeps the session active and confirms the server is still responding, so the next SendEmail doesn't fail on a silently-closed connection.

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IncludeFile "CkMailMan.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  Demonstrates the MailMan.SmtpNoop method, which sends an SMTP NOOP command to the server.
    ;  NOOP does nothing except elicit a positive response, useful for keeping a connection
    ;  alive or verifying it is still responsive.

    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)
    CkMailMan::setCkSmtpUsername(mailman, "user@example.com")
    CkMailMan::setCkSmtpPassword(mailman, "myPassword")

    ;  Open the SMTP connection.

    success = CkMailMan::ckOpenSmtpConnection(mailman)
    If success = 0
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        ProcedureReturn
    EndIf

    ;  Send a NOOP to keep the connection alive.
    success = CkMailMan::ckSmtpNoop(mailman)
    If success = 0
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        ProcedureReturn
    EndIf

    success = CkMailMan::ckCloseSmtpConnection(mailman)
    If success = 0
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        ProcedureReturn
    EndIf

    Debug "SMTP NOOP succeeded."


    CkMailMan::ckDispose(mailman)


    ProcedureReturn
EndProcedure