On 10/13/2014 4:21 AM, Joe <j...@jretrading.com> wrote: > The intention is that the spam emails be accepted by a catch-all > domain-wide mail server, then later bounced by the one that holds the > mailboxes and knows the addresses are invalid.
And that, by definition, is backscatter, which will quickly (and deservedly so) get you blacklisted if your mail server handles even a moderate volume of mail, and eventually in any case. > If the authoritative mail server for the domain knows the genuine > recipients, it doesn't work, and that's the biggest single anti-spam > measure possible. No, that is one of many big mistakes that people new to administering mail servers make. Professional mail admins will virtually never, under any circumstances, accept mail then later bounce it. I use the 'virtually' qualifier because there may be some experienced admins who have tools that give them a high level of confidence and they may bounce certain emails that they know are legitimate, but for policy reason, they decide, after having accepted it, that they do not want to deliver it - but they will (and should) only do this for mail that they have as close to a 100% certainty that the sender is legitimate (not forged), and this is very hard to do, which is why 99+% simply won't do this. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/5440f73e.1060...@libertytrek.org
