B4X

Office365 Send Email using SMTP with OAuth2 Authentication

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Demonstrates how to send email from smtp.office365.com using OAuth2 authentication. B4X

Dim success As Boolean = False

'  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.
Dim jsonToken As ChilkatJsonObject
jsonToken.Initialize
success = jsonToken.LoadFile("qa_data/tokens/office365.json")

Dim mailman As ChilkatMailMan
mailman.Initialize("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
Dim email As ChilkatEmail
email.Initialize

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 Then
    Log(mailman.LastErrorText)
    Return
End If


'  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 Then
    Log("Connection to SMTP server not closed cleanly.")
End If


Log("Mail Sent!")