I have a script to import mail contacts into AD and it works great. The problem is with the mail part of it. For a mail contact that has an outside e-mail address (SMTP), does there also need to be an internal address in order to send mail to it. If I turn on "automatically update e-mail addresses...", I can send mail to the contacts without any problem. If I uncheck that option, I can't.

Hi,Did you check whether the NDR was received? Which queue did the message hung?For the external contacts, there is no need to have internal address. I would like to confirm whether the outbound email is sending normally.ThanksAllen