The exclamation point was once reserved for hard selling (Buy now!!!). But today, the punctuation mark has become pervasive, being inserted throughout professional communication as a way to soften a request or add levity to a message.
Critics, however, note that such use can make an author appear inexperienced, immature, or unprofessional, especially in e-mails sent in workplace situations. These tips can help guide young professionals to hit the right tone without abusing a punctuation mark.
From Business Insider
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