We have been unable to get Nextcloud to send mail to external users. We know this is likely an authentication/relay issue with our mail server, however we have been unable to fine an authentication method that works. If we turn off authentication we are able to send mail to internal users without a problem.
Where can we find logs in Nextcloud to help us determine what the issue might be?
Are there any suggestions on what the mail settings should be for connecting to an Exchange 2013 server for an authenticating user?