this replaces faulty address parsing code with calls to stdlib' email parser and some reasonable fallbacks.
note that nntpArticle.Email() function was completely incorrect, but it's not used anywhere in code, apparently.
This axes out literally insane overly restrictive regex-based
Message-ID check and replaces it with clean and simple conditions
specified in RFC 3977.
Old check wasn't compliant with any email or netnews internet
standard I know of, and was causing propagation issues.
Even old RFC 822 (email) and RFC 850 (usenet) specifications
don't have so restrictive specifications.
cathugger