Need a Placeholder name for subscribers added to my email list without a first and last name

I was thinking “friend” so “hi {firstname} will appear as “hi friend” but is there anything else I can use?

submitted by /u/KurryBandit
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source https://www.reddit.com/r/Emailmarketing/comments/i50f0c/need_a_placeholder_name_for_subscribers_added_to/