I am getting delivery status notifacation errors when trying to reply to an externally bound email. I.e. if I send an email from email@example.com to firstname.lastname@example.org it arrives in my @hotmail.com mailbox but when I try and reply, or compose a new email to email@example.com I am getting delivery failure notices every time. If someone at work i.e. firstname.lastname@example.org sends an email to email@example.com it comes through fine. Any ideas. I have 2x SMTP addresses configured for incoming mail into the same exch2010 mailbox if thats of any factor in this.