@eXch Support
It doesn't help me to provide you proof of reporting when my email address is rejected by your spam filter.

Did I something wrong? Why are my reporting copies (usually you're in BCC) rejected by your spam filter. I would appreciate if you could whitelist my email address (see below from my screenshot):
Hello Cricktor
It seems the spam filter in question is Proton Mail's itself, not ours. Proton Mail sometimes rejects outgoing emails for suspecting it might be a spam that their user sends.
We'll contact you privately in due time (before the rewards are distributed).