SUMMARY
Mail being sent from MCI to a downstream postoffice is first picked
up by the MCI gateway. The gateway looks at the TO: address of the
mail message: if the mail is going to a downstream postoffice, the
gateway puts the mail in that postoffice's queue, along with any other
local mail going to the downstream postoffice.
The External program picks up mail items from the queue and transmits
them to the downstream postoffice.
For more information, query on the following words in the Microsoft
Knowledge Base:
pcmail and mci and indirect and downstream and external