Sending messages immediately
To send your message, click Send. This button is only displayed after you have addressed the message.
Sending messages later
To close a message and leave it unsent, click Save. The message stays in your Mailbox with an unsent flag beside it.
You can open the message later to update and then send it.
What happens when you send a message
When you send a message to several people, only one copy of the message is actually created. It is stored on the server, and links to it are stored in your Mailbox and the Mailboxes of all recipients.
You can change the properties of your own link, or even delete it, without affecting the links in others' Mailboxes. The actual message stays on the server as long as there are any links to it, and it has not expired.