Overrides the default value for the IMail Host value found in the Q File.
This property is for advanced IMail developers only. It does not need to be set to send email to the IMail spool directory. This value will set the Host value in the Q File, as required by IMail. By default, the Host value is the domain name extracted from the FromAddress. If IMailHost is set, it will override the domain name extracted from the FromAddress. For more information about the IMail Q File format, visit the IMail site at http://support.ipswitch.com/kb/IM-20030324-DM01.htm