From owner-freebsd-isp Thu Dec 17 04:58:48 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id EAA22308 for freebsd-isp-outgoing; Thu, 17 Dec 1998 04:58:48 -0800 (PST) (envelope-from owner-freebsd-isp@FreeBSD.ORG) Received: from claret.cisco.com (claret.cisco.com [161.44.2.33]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id EAA22303 for ; Thu, 17 Dec 1998 04:58:47 -0800 (PST) (envelope-from fty@cisco.com) Received: (fty@localhost) by claret.cisco.com (8.8.4-Cisco.1/8.6.5) id HAA24958; Thu, 17 Dec 1998 07:57:08 -0500 (EST) Date: Thu, 17 Dec 1998 07:57:08 -0500 (EST) From: Frank Terhaar-Yonkers Message-Id: <199812171257.HAA24958@claret.cisco.com> To: tups@novobcs.ee Subject: RE: smtp "polling" thru a firewall Cc: freebsd-isp@FreeBSD.ORG X-Face: ,fjtWiMPydUaSQl%8[eTg`u:^BXt&T)Sny(6w\*U"5D9H[Z$kG%Q/z;Z=NwrPiXf-aMF3R) Rsand$,]26-8>5@HD(A3A79gN|0%NHsdek4mT8E,>j+\w!~d2#nH;~NV!5a0"`5$Cj8d\or(Jy/JQ_ |uc;C[filmZ(~#lre*l:|O%d/PJFy`.5w8)sMZ-)QI3TaV"j'k X-Mailer: [XMailTool v3.1.0] Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org I understand. But in my case I cannot do the MXing on the firewall machine. It's a "political" decision. So, the only way to get mail into the machine inside the FW is to open a socket connection from inside, which then allows two way communication with an smtp server anywhere on the outside. thanks - Frank >> I've a situation where a domain sits behind a firewall. I'd >> like to set >> up a "polling" situation so the mail server inside the FW can >> grab mail >> from the MX'd server outside the firewall. It appears that >> "fetchmail" >> may do this with newer sendmails that are configured to use >> ESMTP. The >> other problem is the IP # that the inside server has will be dynamic >> (assigned by the firewall) WRT the outside. It seems this will cause >> validation problems as there will be no DNS mapping. > >In our Company, MS Exchange server stands inside behind FBSD firewall. >FBSD machine is MX for our domain, and its /etc/mailertable has entry: > >novobcs.ee smtp:[exchange.novobcs.ee] > >exchange.novobcs.ee is declared by dns as IP for our inside exchange machine >It may be 192.168.x.x or whatever > >If anyone sends email for our domain, it will be first sent to firewall >which is MX , and then firewall will send it directly to inside machine > > \\\\////\\\\////\\\\\////\\\\\////\\\\////\\\\////\\\\////\\\\////\\\\////\\\\ Frank Terhaar-Yonkers Cisco Systems, Inc. TISU/NSITE 7025 Kit Creek Road PO Box 14987 Research Triangle Park, North Carolina 27709 fty@cisco.com voice(919)472-2101 fx(919)472-5600 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message