On Wed, Aug 19, 2009 at 10:24, Bill Songstad (WCUL)<administra...@waleague.org> wrote: > Okay, backscatter is an annoyance at the very least. So I want to do > something about it. My messaging queue is 90% NDRs to domains and > subdomains with no MX records. > > > > Of course the easy solution is to just uncheck “allow Non-Delivery reports” > in Internet Messaging formats within ESM. But my organization provides > research services via email request to thousands of members. Sometimes the > members just fire off an email to the researcher who helped them last time. > But, that researcher may be gone from the organization. So how do you have > the NDR functionality without feeding the spammers and contributing to > backscatter? > > > > Just trying to brainstorm here > > > > Bill
Following the conversation, I second the motion to refuse delivery for non-existent accounts - reject with a 5xx . For my part, I find that a separate email gateway is very useful for this. I use Maia Mailguard, but even just postfix with a list of accounts that you update regularly from AD would be helpful. Keeps the trash away from Exchange. Kurt
