CkPython

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.

Chilkat CkPython Downloads

Download Chilkat for CkPython

CkPython

import sys
import chilkat

success = False

#  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.

mailman = chilkat.CkMailMan()

#  Configure the SMTP server connection.
mailman.put_SmtpHost("smtp.example.com")
mailman.put_SmtpPort(465)
mailman.put_SmtpSsl(True)
mailman.put_SmtpUsername("user@example.com")
mailman.put_SmtpPassword("myPassword")

#  Open the SMTP connection.

success = mailman.OpenSmtpConnection()
if (success == False):
    print(mailman.lastErrorText())
    sys.exit()

#  Send a NOOP to keep the connection alive.
success = mailman.SmtpNoop()
if (success == False):
    print(mailman.lastErrorText())
    sys.exit()

success = mailman.CloseSmtpConnection()
if (success == False):
    print(mailman.lastErrorText())
    sys.exit()

print("SMTP NOOP succeeded.")