Re: Need To Reject Inbound From Addresses with My Own Domain/s

[Noel Jones]

wiskbr...@hotmail.com wrote:
Recently I've been getting a ton of email for a new domain we've registered and 
have begun receiving email for.  Our users in this new domain are either
1. receiving email with a From address identical to their own, or
2. receiving email with a From address of one of our other three domains, none 
of the emails are valid and the real sender is sending the email from the 
internet and through an external postfix gateway/relay box.

Here is a sample of my main.cf:

smtpd_recipient_restrictions =
        permit_mynetworks,
        reject_unauth_destination,
        check_sender_access dbm:/etc/postfix/blocked_senders,
        reject_rbl_client CLIENT-LICENSE.mail-abuse.com

Here are the contents of my /etc/postfix/blocked_senders file:

"operator#...@somephishingbanksite\.com"        REJECT

The above line is the wrong syntax and will never match 
anything.  Wildcards are not allowed in dbm or other indexed 
files, and quotes should never be used.

mydomain.com   554 mydomain.com sender? But you're not in my network ...

Yes, this will reject your own domain when used outside 
$mynetworks.

  -- Noel Jones