Last week started having an issue in that I could not access a clients Exchange 2016 server EAC/ECP management pages from a remote PC – it was fine on the server itself. It seems to have started after a recent Exchange or Windows update DISABLED all Exchange and IIS services …. but never turned them […]

If you send email to domains that used to be hosted on your Exchange organisation you receive NDR error 5.1.1 – similar to this: The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address. You may […]