warn on man page that unencoded subject are not portable

積丹尼 Dan Jacobson <[email protected]>
Newsgroups gmane.comp.gnu.mailutils.bugs
Message-ID <[email protected]>
$ man mail

   -s, --subject=SUBJ
              send a message with the given SUBJECT

But warn that will be unreadable in Gmail('s Android app etc.), as the
subject will not be properly encoded.

$ echo test|mail -s 'ABC 測試' [email protected]

What will work needs to look like

$ echo test|mail -s 'ABC =?UTF-8?B?...' [email protected]

else the user will see 'ABC ???????' in Gmail.
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