I have run into an issue with one user who we send external email to but she never receives it. I have verified that the email has made it into our system. Then I am using Exchange message tracking to verify the path the email took. Message tracking says the email was delivered to her mailbox store, but if you go into her mailbox the message is not there. There are no restrictions on her account as far as quota and she is set to accept email messages from everyone. Can anyone point me in the right direction to resolving this issue.