Proton Mail is cooperating with state authorities and will hand over your communication and ip address, citation:

"This weekend, news broke that the anonymous email service ProtonMail turned over a French climate activist’s IP address and browser fingerprint to Swiss authorities. The move seemed to contradict the company's own privacy-focused policies, which as recently as last week stated, "By default, we do not keep any IP logs which can be linked to your anonymous email account."