E-mails are one of the most frequently used and authentic means of communication during engineering and design phase of various EPC projects. An effective e-mail communication can positively impact the cost and schedule of project deliverables. In this work, we studied various factors which affect quality and flow of mails in various disciplines of engineering design. Some of those factors are: number of senders/recipients, trailing mails, attachments, subject and main body of e-mail. Good management of e-mails and its folders at personal level can be helpful to prepare work plans and to set priorities of actions to be taken by individuals. It has also been mentioned that how e-mails can be considered and managed as an Intellectual Property Asset of project (or client) like other documents and standards.