How do I block emails from being received in Roundcube from sender not within the intranet setup? We have a membership site and want only members to be able to send emails to each other and not spammed.
For example if the domain is
Happy Harry's Pharmacy | Walgreens and 2 emails (tiffany@happy.com and
jane@happy.com) exist. If my email is
123@outside.com and I send emails to either or both happy.com emails, it should be blocked, not received by either email.
Thanks for your attention.
Sheba