Provide option to unquote localparts when normalising

[tdelaney-leadiro]

If a quoted localpart only contains a string that would be valid as an unquoted localpart, it would be useful to have an option to have normalisation return the localpart unquoted e.g. with the option enabled:

"test.1"@example.org would normalise to test.1@example.org
"test..1"@example.org would remain as "test..1"@example.org (because consecutive . can only appear in a quoted localpart)

The use case for this is detecting duplicate email addresses.

[RohanNagar]

Hey @tdelaney-leadiro, thanks for opening this issue! This seems like a great enhancement. I will try to get to this as soon as I can.

[RohanNagar]

This option is now available in v1.6.0! There are two ways to configure it:

1. Call the new normalize(boolean) method and pass in true.
2. Set the -Djmail.normalize.strip.quotes=true JVM system property.

Example:

Email myEmail = Email.of("\"test.1\"@example.org").get();

String normalized = myEmail.normalize(true);

// normalized == "test.1@example.org"

or

System.setProperty("jmail.normalize.strip.quotes", "true");

Email myEmail = Email.of("\"test.1\"@example.org").get();

String normalized = myEmail.normalize();

// normalized == "test.1@example.org"