I have upgraded to Beta6 and since the upgrade internal users can send email to other internal users but no one can send email to external addresses.
The error is 550 relaying denied
I'm running in server only mode.
I can however, send email from the outside world using the advanced setting in Outlook with SSL enabled SMTP port 465 and POP3 995 without issue.
This is a head scratcher for sure.
Any assistance is appreciated.
edb