hello,
i have exchange 2010 and lotus mail server in organization. Most of the mailboxes are on exchange, only few of them are on lotus, and few users have both smtp exchange mailbox and lotus email. Exchange is internal relay for lotus, and most of the time relaying works fine.
sometimes exchange relays emails for users that have mailbox on exchange server to lotus. Lotus refuses it and we got NDR forwarding loop excedded.
to me it sounds like a bug, because exchnage relays messages for it own mailbox. Did anyone had simular situation or solution?