(Chilkat2-Python) Office365 Send Email using SMTP with OAuth2 Authentication

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Demonstrates how to send email from smtp.office365.com using OAuth2 authentication.

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import sys
import chilkat2

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# An Office365 OAuth2 access token must first be obtained prior
# to running this code.

# Getting the OAuth2 access token for the 1st time requires the O365 account owner's 
# interactive authorization via a web browser.  Afterwards, the access token
# can be repeatedly refreshed automatically (with no user interaction).

# See the following examples for getting and refreshing an OAuth2 access token

# Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
# Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

# First get our previously obtained OAuth2 access token.
jsonToken = chilkat2.JsonObject()
success = jsonToken.LoadFile("qa_data/tokens/office365.json")

mailman = chilkat2.MailMan()

mailman.SmtpHost = "smtp.office365.com"
mailman.SmtpPort = 587
mailman.StartTLS = True

# Use your Office365 email address for the SmtpUsername.
mailman.SmtpUsername = "OFFICE365_EMAIL_ADDRESS"
mailman.OAuth2AccessToken = jsonToken.StringOf("access_token")

# Create a new email object
email = chilkat2.Email()

email.Subject = "This is a test"
email.Body = "This is a test"
email.From = "MY_NAME <OFFICE365_EMAIL_ADDRESS>"
success = email.AddTo("John Doe","somebody@example.com")

# Call SendEmail to connect to the SMTP server and send.
# The connection (i.e. session) to the SMTP server remains
# open so that subsequent SendEmail calls may use the
# same connection.  
success = mailman.SendEmail(email)
if (success != True):
    print(mailman.LastErrorText)
    sys.exit()

# If SendEmail failed because of "Failed to get initial SMTP Response", then it may be 
# a firewall or anti-virus blocking communications.
# See https://cknotes.com/smtp-office365-com-failed-to-get-initial-smtp-response/

success = mailman.CloseSmtpConnection()
if (success != True):
    print("Connection to SMTP server not closed cleanly.")

print("Mail Sent!")