If your mail program permits the use of your real name, by all means include it in your mail.
Every mail program has that option.
And since it's often the only hint about your e-mail's content when recipients see your posting, leaving it out is sure to annoy recipients if you repeatedly omit it. I delete without reading messages that lack subject entries. I receive too much e-mail and I'm too busy to try to search for the topics in mail that doesn't identify itself. I treat it as I do junk mail. Regarding the subject entry, make it meaningful.