Configuration with office 365

Hey, could you help me to configure contact form 7 with office 365? I looked in Internet but still I can’t solve it. The thing is that the e-mail including the domain address is on office 365 (you have to use the email in the “From” window in cf7) and I am pretty sure it’s the reason of my problem. The form itself submits that a message was sent, but I tested the mailing on several emails and nothing comes. Any hint where, what to configure?
Greetings