5. The email system of claim 1 , further comprising: a tag composition engine for inserting the tags into the email contents according to the tag related information kept by the content style setting component.
5. The email system of claim 1 , further comprising: a tag composition engine for inserting the tags into the email contents according to the tag related information kept by the content style setting component. 6. The email system of claim 5 , wherein: the tag composition engine is executed once only when a user sends or saves the email.