What does it look like when you receive an encrypted message via email? Here’s an example of an actual secure email encrypted using a PGP key. This is know you know you’ve received an actual encrypted email and if it used your public key properly, and you have the private key to decrypt it, you’d be able to read this message.
Note that this message has been slightly obscured, so technically it is not possible to decrypt this sample encrypted message. This image is an illustration of how an encrypted email appears.