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How does one enter the underscored space in firstname_lastname@institution when using \useURL so that when the link in the PDF is selected, it opens the mail application (Mail.app) and the message is addressed to firstname_lastname@institution? Right now, I have \useURL [AuthorEmailAddress] [mailto:firstname\_lastname@institution] [] [{firstname\_lastname@institution}] in my source file and this displays properly in the PDF produced via ConTeXt. However, when the link is selected in the PDF (in Acrobat) and my mail application opens, the message is addressed to firstnamechar 95 lastname@institution Granted, the user can easily clean this up, but is there way to avoid this? I have tried two or three ways of entering the underscore but with no luck so far. Many thanks. Alan