One user is complaining that he is not receiving some of the emails from external domains recipients. The whole domain is not blocked, eg. receiving email from A@yahoo.com but unable to receive the mail from B@yahoo.com.
I checked in the Queue of SMTP gateway server (Exchange 2003, w.o. SP), then checked in Sprint but no luck. Later (after sending a series of emails from B@yahoo.com), I found in the Sprint that emails are coming but somehow they are disappearing from the mailbox within a few seconds. There is no Delete/Redirect rule defined in the Inbox. The user is using Outlook 2003.
Can you please guide me how to trace this issue? It'll be a great help for me.