A friendly, informal introduction to say why you are writing
A formal form of address that is also used when first contacting a person
An informal way to address colleagues you often work with
A more formal introduction to say why you are writing
Formal way of closing an email
Most commonly used formal&informal close
Friendly, informal close
An informal ending to indicate a reply is necessary
A friendly ending that can be used in formal or informal correspondence
Regards/Best wishes
Just a quick note to...
Hope to hear from you soon.
I am writing to/regarding
Hi/Hello/Hey
(I am) looking forward to your reply.
Dear Sir/Madam
Bye/All the best/Cheers
Yours sincerely