How about storing the users in a text file, one on each line? When a mail file shows up, read the text file, and store the users in an array. shift the first value from the array, and forward the email to that user. Then push that user to the end of the array, and overwrite the file with the new list of users (with the recently selected user now at the bottom of the list.)
Probably not the most elegant solution, but the user list would be pretty easy to maintain.
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