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https://issues.apache.org/jira/browse/MIME4J-34?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565537#action_12565537
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Robert Burrell Donkin commented on MIME4J-34:
---------------------------------------------

"as far as the strict interpretation of the MIME standard is concerned only 
ASCII characters seem permissible"

yes

"and non-ASCII are expected to be escaped using BASE64 or Quoted-Printable 
encodings."

no - AIUI non-ASCII header values not expected at all by the specification. i 
do not know of any way for a client to discover such a transfer encoding. 

there is considerable potential interoperability impact on email (where 
international mail client often interpret the headers using the 
content-encoding) by this patch. 

- robert


> o.a.j.m.message.Header#writeTo violates RFC 822
> -----------------------------------------------
>
>                 Key: MIME4J-34
>                 URL: https://issues.apache.org/jira/browse/MIME4J-34
>             Project: Mime4j
>          Issue Type: Bug
>    Affects Versions: 0.3
>            Reporter: Oleg Kalnichevski
>         Attachments: mimeheader.patch, mimeheader.patch
>
>
> The Header#writeTo method uses the content charset instead of US-ASCII 
> required by the RFC 822. Same problem exists in the Multipart#writeTo. 

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