This study aims to examine the effects of services marketing mix elements on customer equity through the customer experience in order to determine an optimal marketing mix strategy in the service industry. This paper utilizes confirmatory factor analysis and structural equation modeling (SEM) to analyze and confirm the proposed conceptual model. This study finds that the process, people, and physical evidence of the “7Ps” of the service marketing mix impart a positive and significant effect on the customer experience in the post-office setting. This result would help practitioners to create a service marketing strategy to differentiate their service from competitors in order to retain existing customers and attract new ones. It was also found that the customer experience is positively linked to customer equity. From the customer equity perspective, this study provides theoretical support that the customer experience, as one of the service operations management measurements, can be employed to measure service performance, which is also closely related to customer equity.