I am about to go down this route and would like some clarification.

Does the "Outer" IMS  need both SMTP Receiver and Delivery while the "Inner" IMS needs Receiver, Delivery and POP3 services?
Yes. 
 
 The IMS help files say the following:

SMTP Gateway Host
You can specify the host name (or the IP address) of an SMTP server to which all non-local mail will be sent. This may be useful if for instance you are using IMS within a company which stipulates that all outside mail must go through a company-wide mail gateway. Default: no gateway.
This confuses me as it appears to apply only to outgoing mail, not incoming.  But Randy is suggesting that it can also be used for incoming mail. 
 
No, I didn't say that (or at least I didn't intend to).
 
So you add the Inner IMS server address to the SMTP Gateway host of the Outer IMS server.  This will forward all incoming mail from Outer to Inner. 
 
Correct.
 
But what if you want pass outgoing mail through the same filters; i.e through Outer IMS ? How do you do configure the Client, Outer and Inner to do this?
 
You can't do that. I run a degraded set of Trash Finder filters in the inner system to catch obvious problems on outbound mail. But I don't try to do anti-virus filtering or the like - most virii directly do their own mailing anyway. And a full set of filters would quarantine too much outbound mail (it's much less likely to be bad, as we're a business, not an ISP).
 
Purely internal mail from [EMAIL PROTECTED] to [EMAIL PROTECTED] never gets filtered. Yes?? 
 
Well, it certainly goes through the plugins on the internal server. I use SCSMFilter and Trash Finder on both servers; TF has a different set of parameters on each.

I am  using Mike's SMTPRCV. should this be used on both Inner and Outer or what?
 
I only use it on the Outer, but there isn't any reason that it couldn't be used on the Inner. The Inner was my original mail server, and there wasn't any reason to change it (since it no longer accepts mail from the wild).
 
SMTPRCV  has an option on the General tab for Allow Relaying.  Should this option be selected instead of or as well as the SMTP gateway host on the IMS control panel? If so on which Inner or Outer?  
 
No.
 
Sorry if this is confused; but so am I!
 
Hope this helps.
 
David


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