And for that matter the + character in the question is not carried over from web page to web page
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この質問にフラグが付けられました
the practical answer is that you are asking for problems when you accept more than the 'commonly seen' non-alpha chars.
The "practical" answer given is in violation with RFC 822. I would not be shocked that the people who are writing such bad implementations are YOUNGER than the 1982 draft of RFC 822.
To advocate ignoring RFCs leads down a path where the Internet stop working as without RFCs and following the RFCs the internet does not work.
http://www.jacobsen.no/anders/blog/archives/2002/08/24/email_addresses_with_a_are_valid.html
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This is discussed at length at stackoverflow, but the practical answer is that you are asking for problems when you accept more than the 'commonly seen' non-alpha chars. http://stackoverflow.com/questions/2049502/what-characters-are-allowed-in-email-address