How can I restrict some users from sending internet mail?
WorkgroupMail v8 and WorkgroupMail v7 Enterprise
The ability to send mail externally is determined by the Account Restrictions in place for each account. Default settings are configured in the Settings properties and each user account can be configured to either use the defaults or to use individual settings. Tick the option ‘This user cannot send mail to the outside world’.
WorkgroupMail v7 Home/Professional
Edit the Relay Control properties and on the Relaying tab select the option ‘This server does not relay messages for foreign domains (except for trusted hosts)’. Untick the option ‘Mail sent via SMTP authenticated sessions can always be relayed’. Then allow certain computers to be able to send mail to the internet by configuring them as trusted hosts. Click on the Trusted Hosts tab and enter the IP addresses of the mail clients allowed to send internet mail. Those not listed will only be able to send internal mail.