Here’s a quick summary of how to email files from Lightroom:

• The built-in way is to export files as JPEGs to your hard drive, then attach the to an email. Neat, eh? 1990s retro computing enthusiasts line right up!
• To email files directly from Lightroom, see Andréas Saudemon’s Mac-limited export plug-in Send By Mail Plug-in for Lightroom
• For Windows and using an email client like Outlook see Steve Sutherland’s MapiMailer Email Export Plugin for Lightroom
• For those using Gmail on Mac or Windows see Tim Armes’s LR/GMail

Wouldn’t it be so much easier to have File > Send as Email?