We are running Exchange 2007 on a Windows 2008 server. We are experiencing delivery delays to one specific organization and also to the organization that hosts the other organizations email system.
I pulled a log after sending an email to the primary organization and the send information looks normal. But there is generally at least an hour delay before the organization receives the mail, sometimes longer. At this time these are the only two organizations that are experiencing delays. I contacted the admin at the hosting company and he has not changed his spam filtering and he also has our organization whitelisted.
What can I do to determine the cause of the delivery delays?