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I'm using Apache Commons e-mail validator and it refuses to accept email address like: 

ąźóęł@email.com

so I would like to ask if it's right to not allow them or I should change validator?

Alan Moore
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TJL
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1 Answers1

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http://en.wikipedia.org/wiki/E-mail_address#RFC_specification contains all the info you need: a link to the official RFC specs, which characters are good, etc.

drvdijk
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    ...and specifically it says that, without quoting, only roman letters [a-zA-Z], numbers and certain punctuation is allowed in the local-part. – Mark Pim Jul 02 '09 at 14:43
  • In addition to my edit to note that they ARE allowed, please see this answer for more details of the current status: https://stackoverflow.com/a/52133890/1981358 – peater Jan 22 '20 at 16:14