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From "Adam Gordon (JIRA)" <j...@apache.org>
Subject [jira] Created: (VALIDATOR-275) EmailValidator.isValid(String) follows RFC822 but violates RFC1034
Date Thu, 12 Mar 2009 18:18:50 GMT
EmailValidator.isValid(String) follows RFC822 but violates RFC1034
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                 Key: VALIDATOR-275
                 URL: https://issues.apache.org/jira/browse/VALIDATOR-275
             Project: Commons Validator
          Issue Type: Improvement
          Components: Framework, JavaScript
         Environment: All
            Reporter: Adam Gordon
             Fix For: 1.4


Per RFC822, the domain portion of an email address may contain any ASCII character other than
chars 0-31 (control characters), 32 (space character) and any of the following: "(", ")",
"<", ">", "@", ",", ";", ":", "\", <", ".", "[", "]".

However, RFC1034, the DNS Domain Name spec specifies that domain names can only contain alpha
numerical characters and the hyphen/dot characters.

The RFC's contradict each other and while technically the EmailValidator class is doing what
it says (in that it does not guarantee to catch all errors) when one passes in an email address
of the form foo@bar+3.com it yields a potentially bad email address which the user won't find
out about until they actually try and send the email message.  I've not yet found a mail server
that accepts an email address of this format, however it is possible there are legacy systems
out there that do support it.

I realize that this is not a bug, per se, but it seems like EmailValidator should probably
do something or provide some mechanism to ensure that the email address specified is as valid
as possible than waiting until the message is actually sent before failing.

I am, however, open to discussion.

This bug was also filed against the JavaMail API's InternetAddress class here:  https://kenai.com/bugzilla/show_bug.cgi?id=202

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