How do I use tags (aka labels) if I post by email (aka Mail-to-Blogger)?and the unfortunate response is
You can't add labels to a post through Mail-to-Blogger.This somewhat diminishes usefulness of Mail-to-Blogger.
Mail-to-Blogger lets you post text, with titles.
Options, with Mail-to-Blogger, are limited. No adding or editing labels, no changing the post date, no selecting backlinks or comments for the post being created.
With Mail-to-Blogger, you write a post, give it a title, and send it to Blogger. Anything more requires use of either the "Edit Posts" menu, or "Post Options" in Post Editor.