Project managers' email in-boxes often contain hundreds of emails. Analysis of this incoming communication is most likely to provide potentially useful information about team members, their activities and their experiences while performing these activities. However, a project manager who wants to analyze indicators for the state of the project based on stored emails, faces the challenge of how to link semi-structured information on common concepts. Through measurable characteristics of inter-personal communication covering both factual (technical) and personal (human) factors extracted from observations and analysis of "communication" and "communication content", this paper presents a novel approach to application of "communication metrics". To increase project managers' competencies in decoding communication records from their email in-box we focus on "communication metrics" which enables identification of features that might negatively affect progress of the project, the project manager and team members. This in turn provides significant insights into indicators for the state of project health.