I have a user that sent out a email using a public folder email address to all internal users. Only not all users received the email. I looked in the message tracking logs and found that some showed Receive SMTP and a corresponding Deliver StoreDriv. Those users received the email. The others only had a Receive SMTP and NO corresponding Deliver StoreDriv notification and did not receive the email. I am really stuck on this and and am not sure where to look next. Any suggestions would be appreciated.