The use of computer-mediated communication including emails has become pervasive in academic contexts as a result of the COVID-19 pandemic. What seems to be significant but simply overlooked by students is meeting politeness netiquettes while sending emails. To this end, the current study investigated the extent to which non-native English speaking university students adjust the level of politeness in their response emails written in English to that of the emails received from an American professor. To collect data, four versions of an academic email message with different levels of politeness were prepared in advance. The emails either included or excluded verbal and structural politeness markers and asked for the participants’ demographic information and their reason for participation in the study. Then, 73 university students enrolled in a general English course were selected and divided randomly into four groups each of which received one version of the email message from the professor. The results of the data analysis on the participants’ response emails, based on accommodation theory (Giles 1973) as a theoretical framework, revealed that they did not accommodate either verbal or structural politeness cues in emails. Besides, the participants’ knowledge of the politeness etiquettes in the academic email genre seemed inadequate. Finally, the article provides some pedagogical implications for course designers, materials developers, and instructors to devise some plans to raise students’ awareness of email politeness etiquettes and for students to be aware of the significance of meeting politeness principles in their academic emails.