Hey, is it possible to use a separate reply-to email when sending invoices?

Hi,
The invoices will always be sent from the account used to create your bullet account. 
You can change that by doing the following steps. 
Add the multi user app
Add your new email address
Make new email address admin
Logout 
Login as new email address
Open multi user app
Delete your old email address
Uninstall the multi user app, if you don’t want to keep it. 
You can also manage what email address receives the notifications by going to settings
Hope that helps. 

Pete