On 08/31/2011 01:33 PM, m.roth at 5-cent.us wrote: > Josh Miller wrote: >> On 08/31/2011 01:27 PM, m.roth at 5-cent.us wrote: >>> Stephen Harris wrote: >>>>> Here's a thought I just thunk, folks: some scum, apparently in eastern >>>>> Europe, has harvested my email, and is using it in the Reply-To: in >>>>> its spamming efforts. Now, I realize that some mails go out from > <snip> >>>> Anyway, the SMTP server should send the delivery failure to the >>>> envelope address, which may be different to both the From and Reply-To >>>> addresses. >>>> >>> That would be lovely. Unfortunately, a high percentage seem to use the >>> Reply-To address. Trust me, the last four or five months, I've gotten >> >> The Reply-To address is an optional component of the email header and is >> not used in email routing by mail servers. > > I'm well aware that it's an optional component. Thank you for that clarification. > <snip> >> Mail server will send NDRs (non-delivery receipts) back to the envelope >> sender every time with no regard for From or Reply-To. > > You're saying it uses the envelope, not if exists Reply-To, else From? The > problem I have with that is that a few of them have returned the email, > with full headers, and I see the *only* reference to my email address is > in the Reply-To. You are seeing the "full" email headers. You will not see the envelope headers unless you capture packets or view mail server logs, etc.. -- Josh Miller Open Source Solutions Architect http://itsecureadmin.com/