[issue4487] Add utf8 alias for email charsets

[Tony Nelson]

Tony Nelson <tony_nelson at users.sourceforge.net> added the comment:

This seems entirely reasonable, helpful, and in accord with the mapping
of ascii to us-ascii.  I recommend accepting this patch or a slightly
fancier one that would also do "utf_8".

There are pobably other encoding names with the same issue of being
accepted by Python but not be understood by other email clients.

This issue also affects 2.6.1 and 2.7trunk.  I haven't checked 3.x.

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nosy: +barry, tony_nelson

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