Lua

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. Lua

local chilkat = require("chilkat")

-- 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"
--     }
--
local json = chilkat.JsonObject.new()
local success = json:load_file("qa_data/tokens/_gmailSmtp.json")
if not success then
    print("Failed to load GMail access token file.")
    return
end

local accessToken = json:string_of("access_token")

local mailman = chilkat.MailMan.new()

-- Set the properties for the GMail SMTP server:
mailman.smtp_host = "smtp.gmail.com"
mailman.smtp_port = 587
mailman.start_tls = true

-- The SMTP username should be the GMail address of the user's account that authorized your app to send email.
mailman.smtp_username = "chilkat.support@gmail.com"
mailman.oauth2_access_token = accessToken

-- Create a new email object
local email = chilkat.Email.new()

email.subject = "This is a test"
email.body = "This is a test"
email.from = "Chilkat <chilkat.support@gmail.com>"
email:add_to("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:send_email(email)
if not success then
    print(mailman.last_error_text)
    return
end

-- 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:close_smtp_connection()
if not success then
    print("Connection to SMTP server not closed cleanly.")
end

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