What you say is completely correct according to the RFC. But look at
the following headers from a message in my inbox:
To: "'C Mummert'" <mummert(_at_)math(_dot_)psu(_dot_)edu>
X-Mailer: Microsoft Outlook, Build 10.0.4510
Messages like that are why I had added single quotes to the switch.
Searching through ~/mail, I've a minority of emails with addresses like
that so I guess it's more uncommon than RFC-quoted strings. I'd also
vote +1 to have unquote() be RFC-only.
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