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Changes between Initial Version and Version 1 of Ticket #21537, comment 1

-                      initial
+                      v1
 * Uppercase and lowercase English letters (a–z, A–Z) (ASCII: 65–90, 97–122)
 * Digits 0 to 9 (ASCII: 48–57)
 * Characters !#$%&'*+-/=?^_`{|}~ (ASCII: 33, 35–39, 42, 43, 45, 47, 61, 63, 94–96, 123–126)
+* Characters {{{!#$%&'*+-/=?^_`{|}~}}} (ASCII: 33, 35–39, 42, 43, 45, 47, 61, 63, 94–96, 123–126)
 * Character . (dot, period, full stop) (ASCII: 46) provided that it is not the first or last character, and provided also that it does not appear two or more times consecutively (e.g. John..Doe@example.com is not allowed.).
 * Special characters are allowed with restrictions. They are:
  * Space and "(),:;<>@[\] (ASCII: 32, 34, 40, 41, 44, 58, 59, 60, 62, 64, 91–93)
+ * Space and {{{"(),:;<>@[\]}}} (ASCII: 32, 34, 40, 41, 44, 58, 59, 60, 62, 64, 91–93)
  * The restrictions for special characters are that they must only be used when contained between quotation marks, and that 2 of them (the backslash \ and quotation mark " (ASCII: 32, 92, 34)) must also be preceded by a backslash \ (e.g. "\\\"").
 * Comments are allowed with parentheses at either end of the local part; e.g. "john.smith(comment)@example.com" and "(comment)john.smith@example.com" are both equivalent to "john.smith@example.com".