When using the add on, i notice the "From" of the email is : "firstname.lastname@example.org". I suggest the "From" should be the same as contact us email. I modified /public_html/library/bdMails/Transport/Mailgun.php : line 90. From PHP: $request['from'] = $this->bdMails_validateFromEmail($request['from']); to PHP: $request['from'] = 'email@example.com'; Other suggestion, when i switched the "Provider" setting of bd mails from "Mailgun" to "Default", the "Mailgun" API key & Domain setting should not be erased. Because i switched between mailgun to default & vice versa several times during tesing. Bug report : "Bounced Email Processing" does not seem to work. Because the "Return-path" in mail header looks like this : Code: Return-Path: <bounce+7ea4bb.8b5f29-MYDOMAIN.com=gmail.com@mailer.MYDOMAIN.com> Or should i change something in my Mailgun account setting? Thank you.