Why is it important to have an email marketing sunset policy for graymail?

Unengaged contacts can lead to higher negative metrics, which impacts your deliverability.
Engaged contacts provide a wealth of behavioral data, which must be integrated into the CRM.
Unengaged contacts require more emails to nurture them back, so the use of colorful personalization is key.
Engaged contacts allow for more colorful experiments with copy and design, which are integral to sunset policies.

The correct answer is:

Unengaged contacts can lead to higher negative metrics, which impacts your deliverability.