I have configured external output and it is working fine.
but the issue is that when the email is going to the external customer, the sender email address is actually the user's email address (the person who created the invoice). Now business has a logical requirement that the sender email address should be unique (something like :info@companyname").
Can anyone please help me out with this issue.
For a work around i have given the same email address for all the users who creates the invoice but this actual creates problem when sending internal emails.