Xbase++

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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LOCAL nSuccess
LOCAL oMailman

nSuccess := 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.

oMailman := CreateObject("Chilkat.MailMan")

//  Configure the SMTP server connection.
oMailman:SmtpHost := "smtp.example.com"
oMailman:SmtpPort := 465
oMailman:SmtpSsl := 1
oMailman:SmtpUsername := "user@example.com"
oMailman:SmtpPassword := "myPassword"

//  Open the SMTP connection.

nSuccess := oMailman:OpenSmtpConnection()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    RETURN
ENDIF

//  Send a NOOP to keep the connection alive.
nSuccess := oMailman:SmtpNoop()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    RETURN
ENDIF

nSuccess := oMailman:CloseSmtpConnection()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    RETURN
ENDIF

? "SMTP NOOP succeeded."

oMailman:destroy()