We have set up our domino environment with relay hosts:
Domino Mail server --NRPC--> Domio Gateway Server --SMTP--> IronPort
First, you need to tell the Domino Infrastructure to route Internet Mails to the Domino Gatewa server(s). This is done via a Global Domain document and connection document (this is a std. setup).
For the Domino gateway server(s) create configuration document(s) with the following settings:
Router/Smtp->Basics: Relay host for messages leaving the local internet domain: [ip1,ip2] Use authentication when sending messages to the relay host: Disabled Local Internet domain smart host: Smart host is used for all local internet domain recipients: Disabled
For the relay host setting: You can specify one ip or fully qualified servername here (guess without brackets) If you want multiple servers (e.g. because you have multiple IronPorts) you should use IP addresses in  seperated by "," like [192.168.0.10,192.168.0.11]. Domino will try ip1 first. If ip1 is not available it will fall back to ip2. You can have more than 2 ips listed but no mix of ip and fqn. Note: I encountered problems when using fqns.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...