If you get any of the messages listed below, this means the recipient’s mailbox is full and cannot receive any additional messages. The three-digit code associated with this error is usually 552. If this is the case, please let the person know by other means (telephone, Facebook or any other form of contact), so he or she can delete old messages and spam and solve the problem. This is a good example of why saying “the message I sent to you bounced back” doesn’t help the recipient, as he or she won’t know why; but saying “hey, your mailbox is full, you must delete some messages” will help him or her to solve the issue.
Mailbox is full
Disk quota exceeded
User is over the quota. You can try again later.
The recipient’s mailbox is full and can’t accept messages now.
Mailbox limit exceeded while appending message
Requested mail action aborted: exceeded storage allocation