A 50-item, five-point Likert scale inventory was designed to be a valid and reliable group-administered instrument to provide a profile of the declarative knowledge of electronic mail (e-mail) strategies used by students learning English as a second language (ESL) or foreign language (EFL). The inventory was developed primarily for voluntary use by ESL/EFL teachers. The Strategy Inventory for E-mail Writing (SIEW) is in questionnaire form and has four strategy subscales: cognitive; metacognitive; social; and affective. This report describes the development and pilot testing of the SIEW with two groups (n=51 and 208 college ESL students, respectively), and presents results. Implications for classroom ESL/EFL instruction and for incorporation of learning and writing strategy instruction are examined. The instrument is appended. (Contains 14 references.) (MSE)