It's called Backscatter, and yes, it's a pain. Try this: http://www.postfix.org/BACKSCATTER_README.html
On Mon, Feb 22, 2010 at 11:59 AM, Cameron Camp <came...@logicalwebhost.com> wrote: > Forgive me if this has been asked (or point me thusly): > > My postfix box is getting e-mails where dirtbagspam...@whatever.com > sends to someothercrapaddr...@whereverelse.com and uses a valid e-mail > address on my server for the return, so I get a non-delivery e-mail from > the someothercrapaddr...@whateverelse.com mail server to the client > (virtual hosted) on my server. How can I block clients on my box from > getting these e-mails or discard these automatically, will postfix do > this? Apparently the spammers just got a valid e-mail my client had > somewhere like on a website and just used it as a return address for the > spam operation, or are there other scenarios that would likely cause > this? My box isn't blacklisted, has the right RDNS, and isn't > open-relaying. > > Best, > Cameron > >
