JomSocial ActiveGURU ActivePublisher ActiveAdAgency ActiveiSEO ActiveSocialize Active
The email is coming from the html file.
Here is the file location in Jomsocial: ROOT/components/com_community/templates/jomsocial/layouts/email.html.php
You can edit this file to add your logo image and to edit the style of image.
The text that comes in the email message are coming from the language files
Find the text from line 930 Here : prntscr.com/ikx88