(CkPython) 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.

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import sys
import chilkat

# 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.
mailman = chilkat.CkMailMan()

# 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).
sshHostname = "sftp.example.com"
sshPort = 22

success = mailman.SshOpenTunnel(sshHostname,sshPort)
if (success != True):
    print(mailman.lastErrorText())
    sys.exit()

# 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):
    print(mailman.lastErrorText())
    sys.exit()

# 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.put_SmtpHost("smtp.my-smtp-server.com")

# Set the SMTP login/password (if required)
mailman.put_SmtpUsername("smtpLogin")
mailman.put_SmtpPassword("smtpPassword")

# Create a new email object
email = chilkat.CkEmail()

email.put_Subject("This is a test")
email.put_Body("This is a test")
email.put_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):
    print(mailman.lastErrorText())
    sys.exit()

# If you're curious, have a look at LastErrorText after
# a successful send.  You'll see detailed information that 
# confirms the SSH tunneling.
print(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.  

print("Mail Sent!")