SMTP SSH Tunneling (Port Forwarding)

Demonstrates how to setup an SSH tunnel for SMTP. This example connects to an SMTP sever via an SSH tunnel and sends an email.

Download Chilkat Email ActiveX

Download Chilkat IMAP ActiveX

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    --  The mailman object is used for sending (SMTP) and receiving (POP3) email.
    DECLARE @mailman int
    EXEC @hr = sp_OACreate 'Chilkat.MailMan2', @mailman OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  Any string argument automatically begins the 30-day trial.
    DECLARE @success int

    EXEC sp_OAMethod @mailman, 'UnlockComponent', @success OUT, '30-day trial.'
    IF @success <> 1
      BEGIN
        PRINT 'Component unlock failed'
        RETURN
      END

    --  Connect to an SSH server and establish the SSH tunnel:
    DECLARE @sshHostname nvarchar(4000)

    DECLARE @sshPort int

    DECLARE @bSmtp int

    --  The SSH hostname may be a hostname or an
    --  IP address, such as "192.168.1.108".
    --  The port is typically 22 (the standard port for SSH).
    SELECT @sshHostname = 'www.my-ssh-server.com'
    SELECT @sshPort = 22
    SELECT @bSmtp = 1
    --  The 1st argument passed to SshTunnel indicates whether
    --  a tunnel for SMTP or POP3 is being established.
    EXEC sp_OAMethod @mailman, 'SshTunnel', @success OUT, @bSmtp, @sshHostname, @sshPort
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    --  Authenticate with the SSH server via a login/password
    --  or with a public key.
    --  This example demonstrates SSH password authentication.
    --  Note: This is not authenticating with the SMTP server, it is
    --  for authenticating with the SSH server, which is separate.
    EXEC sp_OAMethod @mailman, 'SshAuthenticatePw', @success OUT, @bSmtp, 'sshLogin', 'sshPassword'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    --  OK, the SSH tunnel is setup.  The mailman may
    --  be used exactly the same as usual, except all communications
    --  are now sent through the SSH tunnel.

    --  Set the SMTP server.
    EXEC sp_OASetProperty @mailman, 'SmtpHost', 'smtp.chilkatsoft.com'

    --  Set the SMTP login/password (if required)
    EXEC sp_OASetProperty @mailman, 'SmtpUsername', 'smtpLogin'
    EXEC sp_OASetProperty @mailman, 'SmtpPassword', 'smtpPassword'

    --  Create a new email object
    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email2', @email OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @email, 'Subject', 'This is a test'
    EXEC sp_OASetProperty @email, 'Body', 'This is a test'
    EXEC sp_OASetProperty @email, 'From', 'Chilkat Support <support@chilkatsoft.com>'
    EXEC sp_OAMethod @email, 'AddTo', NULL, 'Chilkat Admin', 'admin@chilkatsoft.com'

    --  The call to SendEmail automatically connects to the SMTP
    --  server via the SSH tunnel (if not already connected).
    --  Because the SSH tunnel has been previously setup,
    --  this does not establish a direct connection with the SMTP
    --  server.  It directs the SSH server to establish the connection.

    --  After SendEmail completes, the connection (i.e. session) remains
    --  open so that subsequent SendEmail calls may use the
    --  same SSH tunnel.
    EXEC sp_OAMethod @mailman, 'SendEmail', @success OUT, @email
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    --  If you're curious, have a look at LastErrorText after
    --  a successful send.  You'll see detailed information that
    --  confirms the SSH tunneling.
    EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
    PRINT @sTmp0

    --  Note: Some SMTP servers do not actually send the email until
    --  the connection is closed.  In these cases, it is necessary to
    --  call CloseSmtpConnection for the mail to be  sent.
    --  Most SMTP servers send the email immediately, and it is
    --  not required to close the connection.

    PRINT 'Mail Sent!'
END
GO