CF8admin > Server Settings > Mail and some comments.
If your mail server requires authentication, you can specify a user name and password to use.
-0365 requires authentication so use a valid 0365 account details.
The default port number for mail servers. The standard SMTP mail server port is 25.
-0365 will not be accepting requests on port 25 use valid port EG 587.
Enable TLS connection to mail server
Select this check box to enable Transport Level Security (TLS) on the connection to the mail server.
-0365 will only allow secure (makes sense because it's cloud) so enable TLS.
I'm trying to figure out *which* username and password to use, and where to find that info. I could give it my personal account information, but I doubt that'll let me send mail from other accounts. The developers shouldn't know everyone's authentication info. I want to be able to send emails from anyone at my company or any of our aliases.
Did you ever figure out what username to use to enable sending as any user on your system? I have the same problem.
Passing authentication for Office 365 Admin account at CF server may allow other developers to send email..