Those settings are speed related and do not address the allocation of port resources. When the buffer space issue surfaces in the logs a "netstat -a" verifies that all ports up to 5000 are in use, Imail will not attempt to use any ports higher.
That isn't an IMail issue -- Microsoft won't let IMail use ports higher than 5000, without the registry hack that you described. So if you don't use that registry hack, IMail can't use ports higher than 5000; if you do use it, IMail can use ports higher than 5000.
-Scott
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