Please be aware that we don't log email content (and we are also not vulnerable to Log4j). Our anti-spam systems do check for malicious links from third party email services so we can proactively warn users about phishing attempts.
Source IP I got in my test: 185.70.43.80
```
# whois.ripe.net
inetnum: 185.70.40.0 - 185.70.43.255
netname: CH-PROTONMAIL-20140915
mnt-by: protonmail-mnt
org-name: Proton AG
```
From privacy policy https://protonmail.com/privacy-policy
> We do NOT have access to encrypted message content, but unencrypted messages sent from external providers to ProtonMail are scanned for Spam and Viruses to pursue the legitimate interest of the protection of our users.
very disappointing.