Exchange Server is one of the most business critical applications in an organization; accessed by everyone in the organization, everyday and round the clock. It can be from their outlook client, tabs, mobile devices etc. 519 more words
Tags » Exchange 2003
First of all check that routing Group connectors are installed /and configured as bi-directional, between these machine.
Next, if the mailflow is working in/outbound from Ex2010/2003, but you just cant send mail from 2010 to 2003, please check this: 84 more words