Are you sure your last sent mail was delivered? We make you know!
Of course. All your mailboxes at one place.
Have you ever shared a password to your info@ mailbox? You don't have to no more.
Your message might never get delivered and it isn't your fault. Because your server is weakly secured and is used for sending spam.
Anyone can misuse your mail address to send fake messages signed by you. It occurs every day.
When you have full inbox all messages which have been sent to you will be lost forever. And you don't even notice.