Hi, Rajesh,
It's achieved through "Calculating message weight." Weights can be calculated via a formula to suit recipients. For example:
Case 1: Same Email delivery
You can define the weight of delivery based on if a recipient is primary or secondary in a given household.
Case 2: Different Email deliveries
If you are using different deliveries, Assign different weights to different deliveries based on their priority in various/same campaigns.
Case 3: Same Email delivery and no Primary Recipient
If you are using the same email delivery and you do not have a primary recipient in the household, Change your query in the workflow because that's something should be controlled in the targeting workflow or you need to update your data model.
Note: Pressure rules in the recommended way to achieve this.
Filtering rules are used when you want to exclude or include an individual segment of the recipient's into your main target list not to limit the number of messages.
Regards,
Amit