(CkPython) Office365 Send Email from Shared Mailbox

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Demonstrates how to send email from a shared mailbox, from smtp.office365.com using OAuth2 authentication.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

# 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 authorizaition via a web browser.  Afterwards, the access token
# can be repeatedly refreshed automatically.

# 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 = chilkat.CkJsonObject()
success = jsonToken.LoadFile("qa_data/tokens/office365.json")

mailman = chilkat.CkMailMan()

mailman.put_SmtpHost("smtp.office365.com")
mailman.put_SmtpPort(587)
mailman.put_StartTLS(True)

# In case of shared mailbox access using OAuth, the application needs to obtain the access token on behalf of a user
# but replace the SMTP username with the email address of the shared mailbox.

# Login using the shared mailbox email address for the username, and the access token for the password.
# See Office 365 SASL XOAUTH2 format 

# Use your Office365 email address for the SmtpUsername.
mailman.put_SmtpUsername("SHARED_MAILBOX_EMAIL_ADDRESS")
mailman.put_OAuth2AccessToken(jsonToken.stringOf("access_token"))

# 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("MY_NAME <SHARED_MAILBOX_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()

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

print("Mail Sent!")