We have made some changes to our shared email services (not Hosted Exchange) that affect how people send email.
You will need to enable SMTP Authentication if you aren’t using it already.
There are some instructions here
More info here
About the Author: Michele Neylon
Known for his outspoken opinions on technology and the Internet, Michele Neylon is the award winning author of several blogs and co-host of the Technology.ie podcast. A thought leader in the Internet community, Neylon is active within ICANN and an expert on policy, security, domains, ICANN, Nominet and Internet Governance. You can stalk him on various social media networks including Twitter and Instagram
