BANA has established guidelines for brailling business cards. The following quote is taken from these guidelines found on the BANA website.
[quote=]Strategies for Brailling the E-mail Address
An e-mail address should be brailled according to the Computer Braille Code
(CBC). The opening and closing CBC indicators can be omitted if their use will
extend the e-mail address onto a new line. When an e-mail address must be
divided over two lines, try to divide it after the at sign or after a period. Do not
insert hyphens or continuation indicators to show that the e-mail address has
been divided. Begin the second line of the e-mail address in cell 2. An e-mail
address should never be written in contracted braille.[/quote]