On Wed, Jul 03, 2019 at 05:37:31PM -0500, Peng Yu wrote:
OK. I see the problem. Gmail encode it as =?UTF-8..., but mutt encode it as =?utf-8...

Should it be in upper cases instead of lower cases?

No.  Per the rfc section 2, the charset names are case-independent.

Is there a way to let mutt encode using "UTF-8"? Thanks.

No, mutt runs through a canonicalizer which lower cases in the process. Any client that is confused by this needs to be fixed.

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Kevin J. McCarthy
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