We’ve just released the latest Lightroom LR/GMail.plug-in by Timothy Armes -
This export plug-in will send exported images by email using your GMail account.
As an extra nicety, the addresses in your “My Contacts” group are downloaded from your Google account so that they can be offered automatically as you type into the To, Cc and Bcc fields.
The plug-in also tracks to whom you’ve send each photo, which may prove useful to your workflow.
There’s one caveat: the plug-in needs to connect to Google’s SMTP server to send emails, and this may not be possible if you’re behind a company firewall that prevents connections to SMTP servers. You shouldn’t generally have any issues with personal firewalls though.