B4X

GMail SMTP Send using Previously Obtained OAuth2 Access Token

See more GMail SMTP/IMAP/POP Examples

Demonstrates how to send email using GMail and OAuth2 authentication. This example assumes an OAuth2 access token was previously obtained. B4X

Dim success As Boolean = False

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

'  See Get GMail SMTP Access Token 
'  for sample code showing how to obtain a GMail SMTP access token for desktop apps.

'  In this example, our access token was previously saved to the following file which contains JSON like this:
'  	{
'  	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
'  	 "token_type": "Bearer",
'  	 "expires_in": 3600,
'  	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
'  	}
'  
Dim json As ChilkatJsonObject
json.Initialize
success = json.LoadFile("qa_data/tokens/_gmailSmtp.json")
If success <> True Then
    Log("Failed to load GMail access token file.")
    Return
End If

Dim accessToken As String = json.StringOf("access_token")

Dim mailman As ChilkatMailMan
mailman.Initialize("mailman")

'  Set the properties for the GMail SMTP server:
mailman.SmtpHost = "smtp.gmail.com"
mailman.SmtpPort = 587
mailman.StartTLS = True

'  The SMTP username should be the GMail address of the user's account that authorized your app to send email.
mailman.SmtpUsername = "chilkat.support@gmail.com"
mailman.OAuth2AccessToken = accessToken

'  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 = "Chilkat <chilkat.support@gmail.com>"
email.AddTo("Chilkat Admin", "admin@chilkatsoft.com")
'  To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

'  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


'  You may close the connection here.  If the connection is kept open, 
'  the next call to mailman.SendEmail will continue using the already-established connection
'  (and automatically re-connect if needed).
success = mailman.CloseSmtpConnection
If success <> True Then
    Log("Connection to SMTP server not closed cleanly.")
End If


Log("Email Sent via GMail with OAuth2 authentication.")