JAMES-4133 POC RFC-6532 Support for i8n emails

[chibenwa]

CF https://issues.apache.org/jira/browse/JAMES-4133

Fails lamentably:

jakarta.mail.internet.AddressException: Invalid character in local-part (user account) at position 4 in 'ren��@james.org'
	at org.apache.james.core.MailAddress.parseUnquotedLocalPart(MailAddress.java:561)
	at org.apache.james.core.MailAddress.parseUnquotedLocalPartOrThrowException(MailAddress.java:272)
	at org.apache.james.core.MailAddress.<init>(MailAddress.java:193)
	at org.apache.james.protocols.smtp.core.RcptCmdHandler.doFilterChecks(RcptCmdHandler.java:157)
	at org.apache.james.protocols.smtp.core.AbstractHookableCmdHandler.onCommand(AbstractHookableCmdHandler.java:72)
	at org.apache.james.protocols.smtp.core.AbstractHookableCmdHandler.onCommand(AbstractHookableCmdHandler.java:50)
	at org.apache.james.protocols.api.handler.CommandDispatcher.dispatchCommandHandlers(CommandDispatcher.java:165)
	at org.apache.james.protocols.api.handler.CommandDispatcher.onLine(CommandDispatcher.java:142)
	at org.apache.james.protocols.netty.BasicChannelInboundHandler.channelRead(BasicChannelInboundHandler.java:196)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
	at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:61)
	at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:425)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173)
	at io.netty.util.concurrent.DefaultEventExecutor.run(DefaultEventExecutor.java:66)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:994)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at java.base/java.lang.Thread.run(Thread.java:1583)

[chibenwa]

I still need to polish it but I believe I made significant progress toward UTF-8 support in James.

The IMAP part of UTF-8 support might need refinement and numerous other tests would need to be written as well as this work being polished...

[arnt]

FYI, I solved the Jakarta problem that bothered this PR. That PR is blocked until I get permission to sign the Eclipse CLA, but I'm sure that won't take long. I'll return to this code now.

[chibenwa]

Thanks for the heads up and the good work !
I will follow this and adopt release that will ship this change and revive the PR.

[arnt]

@chibenwa can you give me write access to this PR? I have done a little more work (very little to be honest, but I still have half an hour until my wife comes home).

[chibenwa]

:-( sorry arnt I must confess I don't know how to to that...

Github as far as I know do not have such features and for non James maintainer.

Please PR directly the rfc-6532 branch, I'd happily merge it here.