From the location where you have stored your Exchange 2013 files run
The first dialog gives you the opportunity to check for updates to the setup files before you proceed.
This method is not bulletproof but the function does provide a compelling enough argument for an email existing or being a fraud.
If a valid email address is important for your purposes, use this function.
MX (Mail Exchanger) records specify and prioritize the incoming mail servers that receive email messages sent to your domain name. Sometimes you have to update them if you host a website with one network (such as ours) but you have email hosted in another. If you have an email account through another email provider and change your MX record to point to our mail servers, you'll lose access to your original email account.Note: Typically it takes about 15 minutes for DNS changes to take effect.