If you are here because an email failed to go through one of the following is likely the cause.
A Bounce Message is an automated server message that notifies the sender that the message was undeliverable for various reasons. There are many points at the message exchange process that could fail. Bounce messages could be generated by the sending mail-server or the receiving one.
If you receive one from a vistua.com or vistua.net server, this means that our server(s) accepted your message but then discovered that it was unable to deliver the message to its intended recipient.