To send messages to Contacts stored in the Nonprofit Success Pack (NPSP) based on their connections to the nonprofit's corporate funders, use the Affiliations object. Here's how to set it up:

Understand Affiliations:

Affiliations in NPSP track the relationships between Contacts and Accounts. They can indicate if a Contact is associated with a corporate funder.

Set Up Affiliations:

Ensure that all Contacts have their Affiliation records properly set up, linking them to the appropriate corporate funder Accounts.

Create a Custom Report Type:

Navigate to Setup > Report Types.

Create a new custom report type with Affiliations as the primary object and Contacts as a related object.

Build the Report:

Go to the Reports tab and click "New Report."

Select the custom report type you created.

Add fields such as Contact Name, Affiliated Account Name, and any other relevant information.

Filter the report to include only those Contacts who have affiliations with corporate funders.

Send Messages:

Use the report to create a Campaign or a mailing list.

Use Salesforce or an integrated email platform to send targeted messages to the Contacts based on their corporate affiliations.

Salesforce Nonprofit Success Pack Documentation: Detailed instructions on managing Affiliations in NPSP. NPSP Documentation.

These steps and references ensure that the nonprofit can effectively use Salesforce to meet its operational requirements while maintaining best practices and leveraging the capabilities of the Nonprofit Cloud.