var name = "ma@ilbo.x0"
var domain = "o@b.raz!org"

name = name.replace(/@/g, "")
name = name.replace(/\./g, "")

domain = domain.replace(/@/g, "")
domain = domain.replace(/\./g, "")
domain = domain.replace(/!/g, ".")
document.write('<a href="mailto:' + name + '@' + domain + '">Обратная связь</a>')