Anyone who tries to follow-up more than twice comes off as desperate or an automated spambot. I don't appreciate that hustle.
2 follow-ups should be the absolute limit (preferably, a single follow up).
2 follow-ups should be the absolute limit (preferably, a single follow up).
Unless you have a specific reason to believe that there's been some error in the way your email was handled, or unless you have some positive right to a claim on the person's attention, following up IN ANY WAY is beyond the pale.