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US-ASCII text
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... certain level of implementation that allows the useful interworking
of messages with content that differs from US-ASCII text. In this
section, we specify the requirements for such conformance.
...
... send non-MIME messages containing anything other than
US-ASCII text.
In particular, the use of non-US-ASCII text ...
... US-ASCII text.
In particular, the use of non-US-ASCII text in mail
messages without a MIME-Version field is strongly
...