Email for Specific Audiences
Being aware of audience means taking a moment to think about the perspective of the person receiving the email - plus being focused on the purpose of the E-Mail. It helps to consider whether the message is being sent to a family member, a friend, a potential employer, or someone else encountered in the course of business. An E-Mail message to a family member or close friend usually does not require the same level of formality that would be used in a business setting.
If the person receiving the email appreciates brevity over formal grammar then it might be appropriate to abbreviate or add things like smileys. E-Mail sent as part of a business message should be brief and to the point, but should avoid abbreviations and grammar should be checked for obvious errors.