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(C#) 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.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The mailman object is used for sending (SMTP) and receiving (POP3) email. Chilkat.MailMan mailman = new Chilkat.MailMan(); // Connect to an SSH server and establish the SSH tunnel: // 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). string sshHostname = "sftp.example.com"; int sshPort = 22; bool success = mailman.SshOpenTunnel(sshHostname,sshPort); if (success != true) { Debug.WriteLine(mailman.LastErrorText); return; } // 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. success = mailman.SshAuthenticatePw("sshLogin","sshPassword"); if (success != true) { Debug.WriteLine(mailman.LastErrorText); return; } // 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. mailman.SmtpHost = "smtp.my-smtp-server.com"; // Set the SMTP login/password (if required) mailman.SmtpUsername = "smtpLogin"; mailman.SmtpPassword = "smtpPassword"; // Create a new email object Chilkat.Email email = new Chilkat.Email(); email.Subject = "This is a test"; email.Body = "This is a test"; email.From = "Chilkat Support <support@chilkatsoft.com>"; success = email.AddTo("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. success = mailman.SendEmail(email); if (success != true) { Debug.WriteLine(mailman.LastErrorText); return; } // If you're curious, have a look at LastErrorText after // a successful send. You'll see detailed information that // confirms the SSH tunneling. Debug.WriteLine(mailman.LastErrorText); // 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. Debug.WriteLine("Mail Sent!"); |
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