1) Try to limit emails to one page.
2) Keep paragraphs brief but avoid having many short sentences.
3) Separate the closing.4) Avoid multiple font changes, color changes, font size changes, and style changes particularly in the middle of sentences.
In general, avoid parenthesis characters, unnecessary abbreviations (they save very little time for example Please Thank You message). Contractions “don’t” save much time (don’t or do not, can’t or cannot). Without contractions, the rendering of your text improves considerably.
Basic email text is not usually the vehicle for formal documents such as proposals, legal documents, bills and so forth. These are conveyed as attachments by the vehicle of the email itself. When the exclusive purpose of the email is indeed the attachment, special care should be given to provide a description of what the document(s) is, the purpose of it being delivered and any other appropriate information. Additionally any instructions, time-sensitive information or content characteristics should be noted in the text of the email. Avoid using email for severance, bad news or salary freezes. It is the best Netiquette.