Correct spelling, explanation: this spelling is correct because it comes directly from the French word of the same spelling – message. At the same time, mesage is incorrect as the word has never changed the spelling from the French origin. Message is the only correct form.

Definition of message:
noun, a piece of communication left or sent for example by mail; also: a crucial idea behind a piece of art, for example, film or painting
I won’t be home at 10 but you can leave me a message on the desk.
What was the message behind his speech? It was very strange in my opinion.

Incorrect spelling, explanation: mesage is incorrect because it misses one s, as the word was taken directly from the French message, which comes from Latin missus. Therefore message is the correct spelling.

Incorrect spelling

Incorrect spelling