Why not relay mail through the UNIX box too? Tiago de Aviz SoftSell - Curitiba (41) 340-2363 www.softsell.com.br Esta mensagem, incluindo seus anexos, tem caráter confidencial e seu conteúdo é restrito ao destinatário da mensagem. Caso você tenha recebido esta mensagem por engano, queira por favor retorná-la ao destinatário e apagá-la de seus arquivos. Qualquer uso não autorizado, replicação ou disseminação desta mensagem ou parte dela é expressamente proibido. A SoftSell não é responsável pelo conteúdo ou a veracidade desta informação. -----Mensagem original----- De: Dan Klobnak [mailto:dan.klobnak@xxxxxxxxxxxxxxxxxxxxxxx] Enviada em: segunda-feira, 28 de março de 2005 09:37 Para: [ExchangeList] Assunto: [exchangelist] source mail server IP differs from MX IP: potential blacklist ramifications? http://www.MSExchange.org/ Hi there, My eyes have been swimming from all the reading I did this weekend, and this last issue was when I was a couple short of a six-pack...both literally and figuratively. We are dealing with SPAM (who isn't). But have no real solution in place right now. One particularly attractive option: not making it my problem. My company recently merged with another company, which has an IT staff of 12 to my one with apprentice. They have Saphos Puremessage for Unix in place, and offered to help. The idea seems simple enough. I modify my MX to their perimeter X.X.X.X server. They filter and forward to our server based on a table entry similar to DNS. However, all my sent messages will originate from my Y.Y.Y.Y ip (I'd rather not have it go back through their system) So, does this pose a potential issue regarding blacklists. I *believe* one method of determining SPAM sources is a comparison of source IP to public record (MX)? Or am I really way off on the idea of Reverse DNS? Thanks for the insights! Dan ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: tiago@xxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx