Hi,

Please advise on how I can do the following:

1. Force SMTP request to be authenticated with the Active Directory credential
2. Allow users to send mails to arbitrary address

I used the Admin interface to enable the "Enable Authentication" option in the MTA setting, but SMTP requests still gets processed without authentication. I don't know if this has to do with the fact that Zimbra is currently running in mixed mode (HTTPS for Auth then HTTP)