Mass Email Sender/Blog URL in email?

Hey Guys

I must be missing something but shouldn't it be possible to add the Blog URL of current user into the email sent using mass email sender plugin?

On a Multisite email from the network, you can include things like "BLOG_URL" but that doesn't seem to work in this plugin. I do see "USERNAME" working on this, so am I doing something wrong?

How can you include the user's blog url in an email sent using this plugin? Thanks for the help!