MimePart: fixed not escaped header before encoded into utf-8#102
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…ncoding (#102) When a name in From/To/Cc contained characters outside RFC 2822 atext (e.g. comma or quote in a UTF-8 name), it was base64-encoded as-is. After the recipient decoded it, the raw special chars reappeared in the phrase and could be misparsed (a comma would split one address into two). Wrap such phrases in quoted-string before encoding, so the decoded form is a valid quoted phrase. Applies only to the phrase part of address headers, not to Content-Disposition filename values.
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Headers containing special characters such as Czech characters also need to be escaped before converting to utf-8.
Example header
From: Kdo uteče, obědvá <doe@example.com>When google processes the email, it misparses the comma and because of that the DKIM signature verification fails and the email is rejected.