My ex emailed me today on my birthday? Should I respond?

Short: we’ve been broken up since the end of June and he basically lost his mind acting crazy and coming to my apartment to beg for forgiveness. He also came to job and he harassed me constantly texting me and calling over and over. I told him off last month that i didn’t care for him and today I received an email from him even AFTER he’s been blocked...
My ex emailed me today on my birthday? Should I respond?
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