Re: [IMail Forum] ERTN by Exchange over leased line?

[Vaughn Thurman]

OK, using the Exchange Internet Mail connector you can get Exchange to issue an ETRN on its own.  I can not tell you how to do that as I don't know off the top of my head.  I have seen an article on MS Support KB on how to do that, but you have to have the most recent service packs and all to get it to work right.  Any add on that works is OK though since it will de spool the messages.  I say again though why do you want to spool messages for someone on a leased line?  Can't you set up an exported service from behind that NAT?  What kind of router or NAT device are you using?  Maybe I can help.  More answers below... ----- Original Message ----- From: Len Conrad To: [EMAIL PROTECTED] Sent: Monday, August 23, 1999 3:16 PM Subject: Re: [IMail Forum] ERTN by Exchange over leased line? Yo Vaughn, yeah, we "know" all that, ESMTP etc, stuff, but we can't figure out how to configure Exchange to do it. And, even better, jumping around trying to do it, we broke Exchange's sending to us, which was working fine this morning. Now that just plain hurts huh?  You issue the ETRN, your server finds their server and sends the spool. Who issues ETRN?  We want their Exchange server, behind NAT, to come across the leased line to our ISP, to relay their mail through us.    Getting outbound mail to relay through you should be no harder than to insure that thier exported or NAT IP is in your "relay-for" pool.   The ETRN can be issued by anyone in the world as long as your mail server and thier mail server are both connected at the same time and have either full and proper DNS or hosts [file] entries set up.  The trouble is that with NAT you can not guarantee the address that will be used by the remote server [exchange].  You need to set up an exported service for port 25 of that [exchange] mail server or you will be shooting at a moving target. Imail is set up correctly, and has msgs for their Exchange domain to be picked up by ETRN, but Exchange won't do it. A couple of guys sent me add on pgms, but we'd really like to get Exchange to do it unassisted. Even if you use the Exchange Internet Connector you will still be using an add-on.  The executable that DGregg sent out looks pretty clean to me.  I may use it in place of my old clunky VB script (that I was too embarassed to share) and redirect its output to a log file... (still testing).  It does not matter what issues the ETRN or who or where in the world they are, all that matters is that the primary and secondary mail servers are both on line and are properly resolvable. I'm looking for speicific steps in Exchange to make it pick its mail via ESMTP from our Imail relayer. Sorry to pull this one on you Len, but check http://www.microsoft.com/technet/support/default.htm for the specifics you need.   Best of Luck -V ===============   You get nothing at the telnet prompt but a little note about stuff happening OK. -V   ----- Original Message ----- From: Len Conrad To: [EMAIL PROTECTED] Sent: Monday, August 23, 1999 11:29 AM Subject: Re: [IMail Forum] ERTN by Exchange over leased line? Ok, as a last resort, we can do that, but how is telnet is going to inject the msgs ETRN-received from mymailserver.com into theirmailserver.com domain in Exchange? Certainly (Len, you, naive sucker!), Exchange can be configured to this? The situation is perfectly analogous to mymailserver.com acting as a "bastion host" for theirmailserver.com.  Certainly (there he goes again!), Exchange, somewhere in all its infernal complexity and opaque documenation, can handle this? Len ===================== Set up an AT or batch task to wake up every half an hour or so and run some sort of macro that does: start: Telnet yourmailserver.com 25 ETRN @hisdomain.com quit exit sleep 30 minutes goto start That is more of a conceptual than it is a working model.  I use a small VB executable using "send keys" for one client.  Not so elegant, but has been running without a hitch for near a year and a half now.  Hope that helps, -V ----- Original Message ----- From: Len Conrad <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, August 23, 1999 10:19 AM Subject: [IMail Forum] ERTN by Exchange over leased line? > Our client connects to us via a leased line.  He has Exchange behind NAT, > so Imail forwarding can't reach it by MX connection. > > We'd like his Exhange to us ESTMP and ETRN to come pick up the mail.  We > can't see how to configure Exchange to this. Over dialup lines, yes, but > over a > leased line, no. > > Exchange forwards mail to our Imail just fine.  Imail accepts it as being > from a trusted ip address and relays it on. > > Imail is receiving and spooling mail from Internet for the client's domain > and trying to forward it to the trusted ip address (outside ip on his NAT > box). cool > > The pb is Exchange is not ETRNing to pick up its waiting mail. > > Suggestions? > > Len