Answer:
pomposity
Step-by-step explanation:
Pomposity is a form of social media red flag that centers on individuals or users employing flamboyant captions, words, or catchy phrases to describe something or someone in a way that appears more significant than the reality.
In this case, given that the email is from an "email from an impressive-sounding stranger" means Professor Alexander is using flamboyant words to persuade me to vote for his presidential candidate in a way that is more substantial than the reality.
Hence, in this case, the right answer is POMPOSITY