watch out for spam fax could be scam if you’re using the free e-fax service

Hello Customer,
You have a new fax! Click the attachment to view.
You can also view your faxes in the eFax mobile app or by logging in to your account online.
We’re sorry, but your incoming fax may be incomplete. Please call the sender to verify your fax or to request a re-send.
Your fax may be incomplete because one or more of the following has occurred:
1. Fax transmission was interrupted. 2. "End fax" signal not received. 3. Unable to convert to desired file format.
We apologize for any inconvenience.
Fax Details
Caller ID: UNAVAILABLE
Date Received: 2019-01-10 06:30:24 GMT
Type: Attached in efx
Number of pages: 0
Reference #: yow_did3-15471017-12705683952-10
Your eFax Free account includes 10 inbound fax pages per month.
Want to send faxes? Upgrade to eFax Plus today!
With eFax Plus, you can:
Send 150 and receive 150 fax pages per month
Choose a local or toll free fax number
Sign faxes electronically
And more!
To upgrade, simply log in to your account and select “Update Account” then “Upgrade.”