Describe two measures you can use to evaluate whether an attachment in a message is reliable to open.

If a attachment is not reliable to open, terrible effects can happen, peradventure it may have a virus or even malware that can destroy a computers software. 

To avoid this and stay on the safe side, try the following:-

- Open it in protected view 
- Do not save the attachment on your computer 
- Look at the author and read the message carefully to make sure it is not biased. 
- Open it on a flash-drive 

To have safety measures when opening a file and you dont know if it is reliable or not you should:

Scan the file with an antivirus. ( I prefer Avast )
Open the file in protected view.
Only open the file if you know who sent you the file or where you got it from

They will be angry and maybe sack you

Its all  useless we should stop doing everything digitally