I have a question, First here is the environment: 3 Exchange 5.5-SP3 Servers(Win2k SP2), this is the main e-mail environment. A sendmail server relays outgoing and incoming mail. Incoming mail is distributed to the appropriate exchange server by e-mail aliases for every address, pointing to the appropriate server for that address. The new piece is an Exchange 2000 server that eventually every mailbox will be migrated to. The AD is in mixed mode.
Now here is the setup: Those sneaky Unix guys here have set up some of their own DL's on the Sendmail server. The e-mail addresses of the Sendmail DL's are in the same DNS domain(specifically: 'phcs.com') as the Exchange servers. So we come to the problem...we have moved a few users over to the new Exchange 2k server. When these users were on any of the 5.5 servers, they could send e-mail to one of the Sendmail DL's (eg.: '[EMAIL PROTECTED]'). With their mailbox on the Exchange 2k server, sending to the sendmail DL's fails with an Unkown Recipient NDR back from the Exchange Server. It doesn't seem like a mystery to me why the Exchange 2k server won't send out of the site for an address that it treats as internal. But what I can't figure out is why the 5.5 servers will forward a message to the Sendmail server for an SMTP mail address '[EMAIL PROTECTED]' when the IMS is configured to route all 'phcs.com' to <inbound>. The Senior guys that should know better than I have no clue either. I haven't been here long enough to know if the Exchange servers were somehow hacked to get this behavior. I already have a couple solutions to the problem, but what I'm really wondering is if this is proper behavior for Exchange 5.5 vs. 2000? List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm
