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https://issues.apache.org/jira/browse/MIME4J-222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raman Gupta updated MIME4J-222:
-------------------------------

    Attachment: mime4j-222.patch

I have attached a patch with the enhancement.
                
> MessageImplFactory is needed
> ----------------------------
>
>                 Key: MIME4J-222
>                 URL: https://issues.apache.org/jira/browse/MIME4J-222
>             Project: James Mime4j
>          Issue Type: Improvement
>          Components: parser (core)
>    Affects Versions: 0.8
>            Reporter: Raman Gupta
>             Fix For: 0.8
>
>         Attachments: mime4j-222.patch
>
>
> In order to create a custom Message-Id, one must currently override the 
> method "newMessageId" e.g.
>         return new MessageImpl() {
>             @Override
>             protected UnstructuredField newMessageId(String hostname) {
>                 String fieldValue = createUniqueMessageId(hostname);
>                 return parse(UnstructuredFieldImpl.PARSER, 
> FieldName.MESSAGE_ID, fieldValue);
>             }
>         };
> However, in some cases Mime4j instantiates the MessageImpl internally e.g. 
> DefaultMessageBuilder.parseMessage and therefore the newMessageId function 
> cannot be overwridden. This means that I cannot use DefaultMessageBuilder to 
> create a MessageImpl in which I control how the Message-Id is created.
> Can DefaultMessageBuilder take a MessageImplFactory to create the MessageImpl?

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