Quote Quoting Mr. Knowitall
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I have a different interpretation -- that the language is to avoid a context in which a tenant thinks that being served with a notice is a game of "tag", and either refuses to touch the papers that the landlord is trying to serve or won't open the door for service. I see nothing that would require a signature in order for personal service to be valid.
I agree.

However, a signature would be "best evidence."

In the absence of a signature, I think the landlord would need some other evidence that personal delivery was "accepted" by the recipient and not just the landlord's sayso.