I've gotten emails from random people/ companies in the past. They found my name on LinkedIn and proceed to spam firstname.lastname@company.domain

These get ignored first time round. Second time they get marked as spam. Third time onwards, well I just get a bit annoyed. But I never reply. I should probably try to block that email straight up.

For example, I've received emails from someone every Monday for 5 weeks in a row. And then a few weeks of silence, and then a "circle back on this" email, followed by another few weeks of emails.