In step 6 of the Mailing
wizard one can indicate
what a guest's history must satisfy to qualify for a mailing selection.
(Step 6 only affects the reservations that meet the criteria of Step
5).
For example, that X amount of sales has been generated by the guest's stay
in the hotel, or that the total number of nights that the guest has spent
in the hotel is more or less than X.
The can proceed to step 7 of the mailing wizard after these criteria have also been entered.