Hey Todd, thank for your answer. Do you have any ideas how can it be done? What rules must I use somwhere in exim4 for this to work? The Exchange autoresponder replies only once to any e-mail so I probably am safe regarding the routing problems..
BR, Uros 2011/3/7 Todd Lyons <[email protected]> > On Mon, Mar 7, 2011 at 4:19 AM, Uros Meglic <[email protected]> wrote: > > What I'm trying to do, is to rewrite the "Return-Path:" on my Exim4 smtp > > relay server. The server accepts mail from an Exchange 2007 server and > > relays it to the internet via ISP smarthost. The reason I'm trying to > > rewrite this specific header is, that per some RFC Exchange is creating > > automated out of office e-mail responses with this header present, but > not > > populated, so it looks like this "Return-Path:<>". Our ISP smarthost > doesn't > > accept any e-mail messages if the Return-Path is empty. I can't set > Exchange > > to deliver via DNS. > > It can be done, however I would strongly advise against it because you > are opening yourself up to some pretty severe routing loops. The RFC > they're referring to is: > > http://tools.ietf.org/html/rfc3834 > > The autoresponder should not reply to any email that "has a > Return-Path address of <>". This means that if you change your return > path to non-null, and your autoresponder sends an email to a lesser > quality autoresponder, then that one will reply to yours, then yours > will reply to that one (AGAIN), then that one will reply to yours > (AGAIN), and repeat ad nauseum until yours or his bandwidth and load > spike or customer complaints or yours or his harddrive fills up. > > Your ISP undoubtedly has been hit very hard with spams that were sent > to <> and so they just stop accepting it. But that's not a get > netizen. But then again. I don't know the extent of the problems they > were dealing with. But even so, the RFC's do say that you must accept > mail to <> (but I do still filter the crap out of it). > > In the end, there are good points on both sides, but your ISP is > making your life difficult when it seems like they shouldn't. > -- > Regards... Todd > I seek the truth...it is only persistence in self-delusion and > ignorance that does harm. -- Marcus Aurealius > -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
