“Hoping to help”
“We have [insert fact] in common …”
“Idea for [topic the prospect cares about]”
“10 mins — [date]?”
“Do not open this email”
More…
https://blog.hubspot.com/sales/sales-email-subject-lines-that-get-prospects-to-open-read-and-respond
39 Sales Email Subject Lines That Get Opened
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