1.Do not write in capitals because its shouting.
2.Use proper spelling,grammar and punctuation because if you send a email and its all not spell correctly it will be hard to read and it could change the meaning of the txt.
3.Read the email before you send it because sometimes you don't read and some words are not spell correctly and there would be some misunderstandings.
4.Avoid long sentences because if you send long sentences the person that u send it too will not attempt to read it.
5.Do not attach unnecessary files because it would annoy customers and sometimes if u don't have a good virus scanner you will send them documents full of viruses.
6.Do not froward chain letter just delete the letters as soon as you receive them.
7.Avoid using urgent and important just use them if the txt is really urgent or important.