I don't suppose you're planning to tell us how the XBees are configured in this thread, either.
Yes, the XBees CAN send and receive. An XBee receives from another one on the same PAN that has DL equal to its MY. It sends to whichever XBee has the MY address that it has as its DL.
If one XBee, we'll call it Fred, has PAN ID = 3128, MY = 8001, and DL = 4382, and another XBee, we'll call it Sue, has PAN ID = 3128, MY = 4382, and DL = 3329, then Sue will be able to receive from Fred, but will NOT be able to talk to Fred.
That really sounds like your situation. You need to get Fred and Sue on the same page.