SQL Server

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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SQL Server

--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 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.

    DECLARE @mailman int
    EXEC @hr = sp_OACreate 'Chilkat.MailMan', @mailman OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  Configure the SMTP server connection.
    EXEC sp_OASetProperty @mailman, 'SmtpHost', 'smtp.example.com'
    EXEC sp_OASetProperty @mailman, 'SmtpPort', 465
    EXEC sp_OASetProperty @mailman, 'SmtpSsl', 1
    EXEC sp_OASetProperty @mailman, 'SmtpUsername', 'user@example.com'
    EXEC sp_OASetProperty @mailman, 'SmtpPassword', 'myPassword'

    --  Open the SMTP connection.

    EXEC sp_OAMethod @mailman, 'OpenSmtpConnection', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mailman
        RETURN
      END

    --  Send a NOOP to keep the connection alive.
    EXEC sp_OAMethod @mailman, 'SmtpNoop', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mailman
        RETURN
      END

    EXEC sp_OAMethod @mailman, 'CloseSmtpConnection', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mailman
        RETURN
      END


    PRINT 'SMTP NOOP succeeded.'

    EXEC @hr = sp_OADestroy @mailman


END
GO