I placed a test order after upgrading my store and noticed that I didn't receive an admin email. I then tested SMTP and found the following error message. SERVER -> CLIENT: 220-vps.matrixresurrection.com.au ESMTP Exim 4.87 #1 Fri, 06 Jan 2017 16:18:51 +1100 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.CLIENT -> SERVER: EHLO thrill.com.auSERVER -> CLIENT: 250-vps.matrixresurrection.com.au Hello thrill.com.au [103.250.21.101]250-SIZE