I have a community application which allows users to send private messages and it is built using 'Private Message' module. When a message is sent, the recipient sees the sender's original email address which he has used to register with the system. I would like to use a system generated email address without revealing sender's original email address.
The 7.x-1.x branch of Private Message has this setting in the PM Email Notify submodule. When enabled, there is a E-mail notify tab on the settings page (/admin/config/messaging/privatemsg) that allows you to configure the email's from header.
By default, if this is blank, it will use the site's default system email. It sounds like the module is configured with another token that's referencing the sender's init email.