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Or maybe reconsider how relevant your messages are for the recipient. Political fundraising emails learned this years ago, and they’re the most annoying about it.
Subject: That lawnmower you borrowed
Dear sir,
I am SLAMMING you for your delay in returning my lawnmower. Please return today, or you won’t BELIEVE what happens next! 9 out of 10 billionaires don’t WANT you to know!
Sincerely, Your neighbor.