A screenshot of a letter written by Yudian Wahyudi, rector of the Sunan Kalijaga State Islamic University (UIN) in Yogyakarta, has been circulating in a WhatsApp group for the university's niqab (face veil)-wearing women for two weeks. The contents of the letter has made members of the conversation group anxious. "The letter was issued unilaterally and without prior notification," said Salamah, not her real name, a student in the da’wah (preachin