I have a question on the emails being sent.. I'd like to add a reply-to address in the email.
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If someone invites another the other receives an email.. Now in the header the email is sent from either
<ul> <li>a fixed email address which is set as default. (ie from: no-reply@domain.com) <li>an email address from the person sending the invitation. (ie from: invitingperson@domain.com) </ul>
You can set from address by changing the code which triggers mail sending. Point is for which perticular email you want to change. Look for the code which is responsible for sending email. then you can either set email id by hard coding or using email property of user node.