Software Module for Communication (Letter, application, invitation, etc. send and receive)

Question

Suppose a large service organization (not a business organization or company, suppose the judiciary department of the government, that provides some service but not directly related to clients or customers) wants to automate their paper-based communication (that is, send and receive applications, invitation letters, greeting letters, order letters, etc. or may be faxes) with other organizations.

Is this called CRM system (I know CRM is a part of ERP, but since they have no customers, how can it be a CRM)?

Then what actually the system would be like?

What can it be termed as?

Would this system be a part of ERP?

Answer 1

This sounds more like a document management system, which might be considered a part of an ERP.