no official host name for channel. . .

This error indicates that a channel definition block is missing the required second line (the official host name line). See the chapters on MTA configuration and command-line utilities in the Sun Java System Messaging Server Administration Reference and Chapter 12, Configuring Channel Definitions for more information on channel definition blocks. A blank line is required before and after each channel definition block, but a blank line must not be present between the channel name and official host name lines of the channel definition. Also note that blank lines are not permitted in the rewrite rules portion of the MTA configuration file.