Mailreturnpath wrong usage

I am not sure if this is wrong. But it is true if set it is used as From and Reply address. I changed this some years ago, because many mail servers did not accept email addresses in the From field which did not belong to the domain. Instead the static sender address is only used as sender in the greet card mail.

You should use returnpath only if you have trouble sending the emails without it.

Mail server usage is a real funny thing. ??