[balinor]

It is there...it is this line:

{$lng.eml_signature}

You can either delete the line all together, or edit it in the Languages area. If you aren't familiar with language variables yet, have a read through the manual or just go into the Languages area, select English and then email. You'll see all the variables below. Same for labels, text, error messages, etc. Basically any text in your store can be edited in this area.