A direct translation would be:
"Inscription de votre adresse mail"
Inscription of your mailing address = Subscribe your mailing address....
"dans ma liste de contacts"
In my list of contacts = ...in my Contact List...
"et mise à jour éventuelle."
and replace eventually. = ...and I will update it eventually.
"Merci et bonne année""
Mercy and Good Year = Thank you and Happy New Year
Because he is using a slightly informal tone, it isn't said that he will be doing this, but it is implied, thus the translation is:
Mike,
Subscribe to my mailing list, and I will update it eventually.
Thank you and Happy New Year.
Gosh I LOVE foreign language and translating
