I maintain the website for the Florida Unitiarian-Universalist District. The District Executive Rev. Kenn Hurto has written some guidelines for effective use of email in congregational life (pdf document). If you’ve ever been involved in a nasty or emotional email storm with a club or volunteer group, you might find it a useful and interesting read. For instance, one suggestion Kenn makes is to
Never use E-mail to negotiate anything more important than an appointment. Negotiation is an interaction, a back and forth dialogue best done in person. Exception: you may use E-mail when working out emotionally neutral text language to an agreement or something like by-laws revisions.