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Do you have anything (end subscription form etc) that might reveal if an address opened the email or accepted the signup? Could be spammers probing for valid addresses? not sure if thats a thing with email.

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Yes, I do a simple email validation in PHP using the FILTER_VALIDATE_EMAIL filter. But it sounds silly to use a external site for this kind of validation, right?

No, I meant something that actually tells if there is a user behind the address or not.

Ah ok, I see. I have a "confirmation-thank-you" page, but it's behind a one time token that is only in the email and only valid for 48 hours. And once it's validated the token is no longer valid, so there is no way to get further information.

Once confirmed there is no other public page or anything to get a hint if the email got validated or not.

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