(Tcl) 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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load ./chilkat.dll

# 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.
set jsonToken [new_CkJsonObject]

set success [CkJsonObject_LoadFile $jsonToken "qa_data/tokens/office365.json"]

set mailman [new_CkMailMan]

CkMailMan_put_SmtpHost $mailman "smtp.office365.com"
CkMailMan_put_SmtpPort $mailman 587
CkMailMan_put_StartTLS $mailman 1

# Use your Office365 email address for the SmtpUsername.
CkMailMan_put_SmtpUsername $mailman "OFFICE365_EMAIL_ADDRESS"
CkMailMan_put_OAuth2AccessToken $mailman [CkJsonObject_stringOf $jsonToken "access_token"]

# Create a new email object
set email [new_CkEmail]

CkEmail_put_Subject $email "This is a test"
CkEmail_put_Body $email "This is a test"
CkEmail_put_From $email "MY_NAME <OFFICE365_EMAIL_ADDRESS>"
set success [CkEmail_AddTo $email "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.  
set success [CkMailMan_SendEmail $mailman $email]
if {$success != 1} then {
    puts [CkMailMan_lastErrorText $mailman]
    delete_CkJsonObject $jsonToken
    delete_CkMailMan $mailman
    delete_CkEmail $email
    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/

set success [CkMailMan_CloseSmtpConnection $mailman]
if {$success != 1} then {
    puts "Connection to SMTP server not closed cleanly."
}

puts "Mail Sent!"

delete_CkJsonObject $jsonToken
delete_CkMailMan $mailman
delete_CkEmail $email