- be at least 8 alphanumeric characters,
- be no more than 20 alphanumeric characters,
- contain at least 1 number.
Optional Step 17. Leave this box unchecked if you want this e-mail account to both forward messages to another account and keep the original message in the mailbox of this e-mail address. (In other words, the same messages will be in both mailboxes — the one it was originally sent to, and the one it’s being forwarded to).
Content retrieved from: https://support.appliedi.net/kb/a1354/how-to-create-a-mail-account.aspx.