According to Friedman and Currall's 2003 dispute-exacerbating model of email (DEME),to
Minimize tone problems,we should

Question

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Including titles and bullets helps to simplify the message and make it easier to understand, reducing the chance of tone problems. Avoiding short email messages and using lengthy paragraphs can actually increase the likelihood of misunderstandings and tone problems. Not reminding readers of contacts or groups held in common may also lead to misunderstandings or feelings of exclusion.

According to Friedman and Currall's 2003 Dispute-Exacerbating Model of Email