Jocose orange mail
I think you meant to say "jocular orange mail"!
If that's the case, I'm assuming you're referring to a playful or humorous email about oranges. Here's a possible example:
Subject: The Orange You Glad It's Friday?
Dear [Name],
Hope this email finds you feeling bright and citrusy! As we approach the weekend, I thought I'd send you a little pick-me-up in the form of an orange joke:
Why did the orange stop in the middle of the road?
Because it ran out of juice!
Wishing you a peel-fect weekend, and don't forget to stay hydrated with plenty of orange goodness!
Best, [Your Name]
How's that? Would you like me to come up with something else?