encode( 'MIME-Header', 'New comment in "test Новый пост"')
results in
New comment in "=?UTF-8?B?dGVzdCDQndC+0LLRi9C5INC/0L7RgdGC?="
But http://www.ietf.org/rfc/rfc2047.txt says:
an 'encoded-word' that appears in a
header field defined as '*text' MUST be separated from any adjacent
'encoded-word' or 'text' by 'linear-white-space'
that is it is incorrect that there is no whitespace between the encoded
word inside the quotes and the quotes themselves, apparently the correct
way to encode this would be to encode the quotes together with the rest.