We have Exchange 2003 sp1 installed on and active/passive cluster (Otter1 and Otter2), running on server 2003 sp1. Recently our domain was blacklisted, but since has been removed from all lists. Currently i can run on Otter2 and all SMTP traffic goes out and does not back up in the ques in system manager. however, the moment that i switch back to Otter1 all SMTP traffice fails to connect and the ques slowly begin to grow. In system manager i see the message "The connection was dropped due to an SMTP protocal event sink." We were running GFI MailEssentials Antispam, but that was unistalled when we started having SMTP issues. I am once again at the feet of the experts, please help.
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