General Workflow

user session:
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1. check if there are new emails for the current user, go to step 2 if there are
2. read X1 (absolute value) most recent unread emails headers
3. mark some X2 (% of X1) emails as spam (will be deleted by the mailer session later)
4. delete some X3 (% of X1) emails
5. read some X4 (% of X1) emails, mark as read
6. write some X5 (% of X1) emails (simulate response)
7. go to step 2.

mailer session:
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1. add X6 (absolute value) emails to every user periodically of variable length X7 to X8 (absolute values)
2. read and delete all spam emails (read for spam analysis)
3. archive emails of every user based on an X9 (absolute time range value) oldness threshold

Every run will operate on X10 (absolute value) user sessions. Every session will serve X11 (absolute value) users.
There will be X12 (absolute value) mailer sessions.

Xi variables denote tunable parameters.