The quota for an address defines the amount of mail, in Megabytes, that the account can store. When your mailbox exceeds this limit, the system returns any incoming mail to the sender with a message that states that the recipient’s mailbox is full.
- Click the Email Accounts icon.
- Locate the email account you want to change, then click the Change Quota link beside it.
- Enter a new value for Mailbox Quota, or choose unlimited if you like.
- Then click Change Quota.
That's it! The email account's mailbox quota has been changed.