how to change the default email notifications

OK, I've changed all my email address in the admin - config/email options area

All to the same email address. [email protected]
This is the address I use for the biz, store..

When a new customer creates and account, buy a product, etc. An email goes to the customer but the return address is my default domain email address.

[email protected] which is my domain default email address.
I have no idea how this got into zen other than zen is installed by domain company.

Where can I change the setting that any email from the zen store to any customer would have a reply address:

[email protected]

Thanks!
Peter

Hello,

Was having the same problem today and found an answer that worked for me. Using Dr. Byte's advice from a similar thread, I switched the Config>Email Options>Emails must send from a known domain? to "Yes." Hope that helps!