It's also possible that a new user would be unaware of the PM system and would not know what the red Messages means on the left side of the page. If they don't look, they won't see them.
You can check to see if they were read by the recipient, provided you saved a copy of them, by looking at the Sent Messages column and seeing if the file symbol is purple (unread). If they are yellow, then they were read and have not responded back to you, for whatever reason.
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I am the Sgt Schultz of bowling.
"I know nothing! I see nothing! NOTHING!"
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New to BR? - Please check this:
BR FAQ