(PowerShell) 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 .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.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 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 = New-Object Chilkat.JsonObject
$success = $jsonToken.LoadFile("qa_data/tokens/office365.json")

$mailman = New-Object Chilkat.MailMan

$mailman.SmtpHost = "smtp.office365.com"
$mailman.SmtpPort = 587
$mailman.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.SmtpUsername = "SHARED_MAILBOX_EMAIL_ADDRESS"
$mailman.OAuth2AccessToken = $jsonToken.StringOf("access_token")

# Create a new email object
$email = New-Object Chilkat.Email

$email.Subject = "This is a test"
$email.Body = "This is a test"
$email.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 -ne $true) {
    $($mailman.LastErrorText)
    exit
}

$success = $mailman.CloseSmtpConnection()
if ($success -ne $true) {
    $("Connection to SMTP server not closed cleanly.")
}

$("Mail Sent!")