Hello , I had a request from a client, he wants to have all email blocked and only allow emails in from people he knows, IE; fred@ bedrock.com and no other emails would ever reach his box. Is there a way to do that, whether in ISPCONFIG or in postfix? Thanks..
It might be possible to do that with a custom filter rule (see custom rules tab of the mailbox). The custm rules are written in sieve syntax when you use dovecot and in maildrop syntax when you use courier.
