Thanks for the links. Tried it, still same error as above. Also tried https://github.com/osTicket/osTicket/commit/d48499b66e3ce9950bdccb7d9b8689a5acaa359f same result.I finally gave up and created a connector as documented here as Option 3https://support.office.com/en-us/article/How-to-set-up-a-multifunction-device-or-application-to-send-email-using-Office-365-69f58e99-c550-4274-ad18-c805d654b4c4and that finally works. Thanks for pointing me to that solution.