Automatic reply to messages.
Auto-forward and redirection of messages.
Facility to send copies of a message to many people.
Automatic filing and retrieval of messages.
Addresses can be stored in an address book and retrieved instantly.
Notification if a message cannot be delivered.
Emails are automatically date and time stamped.
Signatures can be attached.
Files, graphics or sound can be sent as attachments, often in compressed formats.
Webmail and mobile email can be used to receive and send messages while on the move.