Date: Thu, 17 Dec 1998 14:38:09 +0000 From: Jason Thomson <jason.thomson@mintel.co.uk> To: andrew@squiz.co.nz Cc: Frank Terhaar-Yonkers <fty@cisco.com>, tups@novobcs.ee, freebsd-isp@FreeBSD.ORG Subject: Re: smtp "polling" thru a firewall Message-ID: <36791751.38AFB680@mintel.co.uk> References: <Pine.BSF.4.05.9812180215190.12626-100000@aniwa.sky>
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You can run uucp over TCP/IP. I don't know how to set it up, but here is a pointer... http://www.freebsd.org/info/uucp/uucp.info.Top.html Andrew McNaughton wrote: > This is not what ETRN does. ETRN allows you to trigger an immediate queue > run on the remote server, but the mail is not going to get sent to you via > the existing connection. If you can't alias or proxy an external port > through to your internal mail serve then you can't in general use smtp. > > There are of course ways to set up tunnels, such that you open a > connection out to a machine which tunnels inbound connections in, but this > probably is not consistent with the security policies you're trying to > work with. > > Perhaps you could use uucp? I don't know much about this. It's mostly > before my time. I seem to remember seeing it suggested for this sort of > situation though. > > Be wary of approaches based on pop/procmail. You'll probably find someone > who suggests it if you look around, but because it uses the mail headers > rather than the SMTP envelope it behaves incorrectly. eg most mailing > lists, including the freebsd ones, do not have the recipient addresses in > the headers. > > Andrew McNaughton > > On Thu, 17 Dec 1998, Frank Terhaar-Yonkers wrote: > > > 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 > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-isp" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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