hxmail.exe is a application which is most likely NOT a virus. So, if hxmail.exe is on your computer, it is most likely ok, and will NOT be a cause for concern. Even if your PC is virus-free, it is still recommended to run a well-known antivirus with a good detection rate, in order to defend yourself against viruses and malware.
Usually, the default name and folder where this program is stored is
C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.8004.42017.0_x64__8wekyb3d8bbwe\HxMail.exe.
The MD5 checksum for this file is 23f99c3716d251edab7df014818ac5ca.
This application is NOT a Windows service. This is very good.
This is a 64-bit executable. It runs using the full capacity of nowadays' computer processors.
hxmail.exe appears to have a visible user interface. This means it doesn't operate in a kind of stealth mode. Its activity is clearly displayed to you.
The digital certificate is missing from this program. The maker did not sign it. This is probably bad.
It has an uninstall routine, which is a good sign. si are uninstall.