A user might mark you as spam in their client if they perceive you as engaging in unwanted marketing especially if they’re unclear where you got their email.
And proton was one of two preferred clients the hurtcore folks liked back when I was learning about OSINT + favored by a few other really rude sets of people so it’s absolutely possible especially if you have one of the newer non dot ch addresses.
Do you have a trusted friend you can try emailing to test?
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Have you previously interacted w these folks?
A user might mark you as spam in their client if they perceive you as engaging in unwanted marketing especially if they’re unclear where you got their email.
And proton was one of two preferred clients the hurtcore folks liked back when I was learning about OSINT + favored by a few other really rude sets of people so it’s absolutely possible especially if you have one of the newer non dot ch addresses.
Do you have a trusted friend you can try emailing to test?
What exactly are you emailing about?