E-mail is an important component of the e-collaborative environment. This study contributes to the literature by using the American Customer Satisfaction Index (ACSI) framework to model the antecedents and consequences of customer satisfaction with e-mail systems. We employ a survey to gather empirical evidence to test the modified ACSI model for e-mail systems. Additionally, we test whether spam has an influence on a user’s satisfaction with his or her e-mail system. Our results generally support the notion that the ACSI framework can be used to model e-mail user satisfaction, but we do not find statistically significant evidence that spam affects overall user satisfaction with their e-mail system.