conflict with tabber widget and Email customization in Subscribe By Email plugin

I just signed up and Downloaded the Subscribe by Email plugin. But i found two issues with that.

My Site is Wordpress MU with 10 different sub blogs.

1.I want to customize the Email being sent by every Individual blogs. like different signature for every blog

2. Email Plugin seems to have a conflict with Tabber Widget we are using , when I activated this plugin my tabs are gone as in 1st image. If I deactivate the Subscribe plugin then tabs show up like in 2nd image