Email communication with customers. Advantages and disadvantages of email marketing communication. All this is compare to email marketing of O2.Forthebeginning I wouldlike to putoneshort and understandable definition of email marketing. Atitscore, email marketing is a toolforcustomerrelationshipmanagement (CRM). Usedeffectively, thisextensionofpermission-based marketing can deliveroneofthehighestreturn on investments (ROI) ofanydigital marketing activity. I choosefordescribingone e-mail, whi...