How to write a good email

There are numerous ways to write an email I would tell u that how you can write a good email. Following steps can make a email more professional,

• Only one should be concentrated.
• Do not write useless word.
• Email should not too long.
• Grammar and spelling should be perfect.
• Wording should be simple and polite.
• Sentences should be small
• Feed back should be asked. 
• Contact information should be there.
• Company name and designation should be there.