To improve inbox placement of emails sent:

- prohibit the same Message ID from being delivered multiple times to the same email address. Prevents a single constituent from receiving multiple copies of same email.
- permit system admins to set target and suppression groups at the center level. E.g., specific suppression groups are automatically applied to each mailing from a center
- permit system admins to set the maximum number of emails sent to a CONS ID or email address in a 24 hour period. Prevents constituents from being overwhelmed with email from different senders within the same organization.