Nouns ending in -age are usually masculine.
The suffix often marks an action, a result, or a collection.
Is message masculine or feminine?
lemessage
The rule behind it
98.8% of -age nouns are masculine
In context
J'ai oublié de lui donner le message.
I forgot to give him the message.
Je lui donnerai votre message quand il viendra.
I'll give him your message when he comes.
Nous avons diffusé le message au monde entier.
We beamed the message to the world.