Mail from iPhone make mac crashing

Dear staff of MacRumors, I've just bought an iPhone 5 and I am experiencing an annoying problem.

This is my first post, and I don't know if this is the right section for posting this (if not, I am sorry).

When I send an email from the iPhone or (apparently) every time the mail app tries to sync, the application Mail on the macbook crashes. I have 2 email accounts (gmail and iCloud). Unfortunately I haven't found a solution yet, is there anyone else having this problem?

Thank you very much,

all the best