On Fri, 2010-07-09 at 13:35 +0200, Administrator Beckspaced.com wrote: > > On 7/9/2010 13:27, Robert Schetterer wrote: > > Am 09.07.2010 12:51, schrieb Administrator Beckspaced.com: > >> hello robert, > >> > >> thanks a lot for your quick reply ... > >> actually it is not always the same IP or host sending the error bounces ... > >> the bounces are sent from hundred of different IP addresses ... > >> > >> any more idea? > >>
Usually you can do very little to prevent forging your domain and sending spam. Some months ago one client of ours too had the same issue, but the issue is very temporary. The short term solution , as someone suggested, will be to temporarily defer all NDR's with a sender check regex file like /<>/ 450 Try Later ( The RFC's say you cant do this .. but sometimes you must be practical :-) ) >From my personal experience I found that if , for your regular mailing you use some sender authentication mechanism like SPF then these NDR's significantly reduce. For eg many servers reject forged messages based on SPF checks so you dont get NDR's from them at least. I guess , spammers ( the more intelligent ones ... I mean ) too would be less inclined to forge a domain that uses sender authentication Because that will reduce the deliverability of their spams Thanks Ram
