Ok, this is a pretty tricky question I believe. This MAY not be an Exchange problem or issue, and might be a problem with my firewall instead, but I wanted to start here first.
Here is the setup:
Cisco 501 PIX, connecting to BellSouth DSL with statically assigned IP address.
PIX is configured to pass TCP port 25 traffic to inside LAN interface where the MS-Exchange server is located
The MS-Exchange server is on a local domain called, "LOCAL.LAN" and is configured to accept and send email for an Internet domain called, "LOCAL.COM", (true domain name hidden for security reasons).
When any email is sent internally to the MS-EXCH server for any domain or email user ID, email is received just fine. Any email sent from the internal LAN to the Internet is sent outbound without error.
The problem is that any inbound email from the Internet destined for the domain LOCAL.COM, it is never received and the sender never receives an "Undeliverable" email response.
Basically what happens is this:
Jane@local.com can send email to any email on the local.lan AND even the local.com domains as long as she is on the local LAN when she does this.
Jane@local.com can send email to her personal email address of Jane@yahoo.com
However, Jane can NOT send email from her personal email address of Jane@yahoo.com to her Jane@local.com address, and does not get any errors back when she does. The email just goes into the 'ether' somewhere.
Any guesses as to WHERE I might look to fix this problem?