What can I do about spoofing?

It seems someone is using my Protonmail email to spoof. I've now gotten 2 emails the look like they are to/from myself noted by Protonmail with this message: "This email seems to be from a ProtonMail address but came from outside our system and failed our authentication requirements. It may be spoofed or improperly forwarded!"

Can I do anything to stop this?

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Reply to: What can I do about spoofing?
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No, you can't.

Except from discarding this e-mail address, start with a new one and keep it as secret as possible. That doesn't guarantee that nobody will try to spoof it anymore, but if it doesn't exist anymore you won't notice it's being used.

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So far no.

Best to delete and not open or reply. Since spoofing discussions are rather well done I'll share the short answer rather than start another discussion.

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One can contact the administrator of email service

Aside from deleting any spoofed emails you get, you can contact the administrator of the email server where the spoofed emails are coming from. You would be best off to include a copy of the email in source form. Depending on the nature of the spoofing, the email account of the spoofer can be frozen, suspended for a specific period of time or even deleted by the email service provider.

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