Exchange 2003 appears to drop connection from 1 incoming domain

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http://serverfault.com – We are running Exchange 2003 on our server in a small business environment. We have no known problems receiving email from anyone, with the exception of one client. They send us emails, but their server cannot connect to ours even after many attempts. Sometimes the messages eventually get pushed through, but most of the time we never receive them. I checked the logs over the weekend and you can see that their server is trying to connect to ours, but then the connection is immediately dropped. This happens every hour for a while, until today at 12:00pm when the connection was made and 3 emails (HowTos)