The email shopuld contain a clear subject line, which makes the reader to saty and open the email to read it.
After opening the email, the reader must understand the message in short time. This can be achived by creating the email in a professional easy way to read for them, by using simple words.
Do not drag it, by expalining eberything.
keep it short and simple.
Give click through action by providing weblink or weblink button, to redirect to the designated webpage