What Does “Mailbox Unavailable” Mean and How Do I Fix It?

//
What does “smtp; 550 Requested action not taken: mailbox unavailable mean?” I can no longer send emails to my friend at *****@live.com …┬áthe mail comes back with this message.

Unless you’ve mistyped the email address, “mailbox unavailable” is likely not your problem, and not something you can fix. It means that your friend’s mailbox isn’t available, for unspecified reasons, and your message could not be delivered.

From there, all we can do is make some educated guesses as to why.

Read moreWhat Does “Mailbox Unavailable” Mean and How Do I Fix It?