I want to setup control on mails to a groups.
Say i want to allow only a group of member to send mails to a particular group.
I will create a group email@example.com and add every account in example.com
I want only firstname.lastname@example.org and IT@example.com group members to be allowed to send mail to email@example.com
Rest all others i want to deny.
Please provide me solution to accomplish this.