Hi, I cannot figure out how to authenticate properly to my Exchange SMTP relay server. I need to set up SMTP so that users can send mail from their mobile phones using SMTP. I have verified that port 25 is open and also that I can send email when I turn on Anonymous Login. The issue is that I don't want to have an open relay and I want users to authenticate to SMTP from any computer or mobile phone and be able to send. I am using the mailbox of the administrator user.
Assuming my user name is "administrator" and my domain is "domain" and password is "password", when I set up Outlook I cannot send once authentication is required. I've tried:
and i cannot authenticate at all. I know my password is correct as I can correctly authenticate and receive IMAP emails on both iPhone and using Outlook. What can I do next to resolve?