I have run into an issue that I hope someone can help me figure out. We recently upgraded to exchange 2007 and apparently there are a few changes in how it handles email.
We currently use our system to process mailing lists for our membership. we do this by creating mail enabled contacts with the end users email address as the forwarding address. these contacts are put into distribution groups for the email list functionality. The problem that we are running into is that we are using nested distribuion lists and if a contact is in multiple nested dl's they are getting multiple emails from us. This was not a problem in Exchange 2003, but apparently was changed in 2007 (by design says microsoft).
I was hoping that there would be a way at the ironport level to determine if a user was in the recipient field multiple times in the email message to strip out the extra entries.
in case I didn't lay out our problem correctly here is an example of how our dl's are set up.
Blastertest (dl firstname.lastname@example.org) Blastertest2 (dl email@example.com) Adamtest (contact pointing to firstname.lastname@example.org) Adamtest2 (contact pointing to email@example.com) Blastertest3 (dl firstname.lastname@example.org) Adamtest (contact pointing to email@example.com)
in this example the user (adamtest firstname.lastname@example.org) is reeiving the email twice. on the ironport it is using the same MID and ICID, just forwarding it on multiple times.
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...