Depends on if you have wildcarded MX records as well too. The mail might never bounce. Who is to say a clever spammer wouldn't setup a wildcarded series of MX records to point to their own SMTP servers, and harvest the FROM/REPLY TO addresses and place them in to their spam lists. (obviously the TO field is wrong, since it's domain bounced - however I wonder if you could take the @part.com and look for valid domains that come close to matching and add THOSE TO: fields to the spam directory) An even WORSE difference in behavior (plus you aren't notified that your mail didn't make it to where you thought it was going) Bill -----Original Message----- From: owner-ietf@ietf.org [mailto:owner-ietf@ietf.org] On Behalf Of Doug Royer Sent: Wednesday, September 17, 2003 2:26 PM To: ietf@ietf.org Subject: Re: [Fwd: [Asrg] Verisign: All Your ... Before the change if I email user@bogushost.com, the email tool would tell me immedatally that no such host exists. Now, it unconditionally sends the email, then later bounces. This is a HUGE difference in behaviour. -- Doug Royer | http://INET-Consulting.com -------------------------------|----------------------------- Doug@Royer.com | Office: (208)612-INET http://Royer.com/People/Doug | Fax: (866)594-8574 | Cell: (208)520-4044 We Do Standards - You Need Standards