Exchange 2007: POP3 ERR Command is not valid in this state
Summary: POP applications report ERR “Command is not valid in this state” after supplying credentials. To verify you try telnetting to POP port 110 of your exchange server:
Telnet Exchangeserver 110
ERR Command is not valid in this state
Resolution: Open your Exchange Shell and enter:
Set-PopSettings -LoginType PlainTextLogin
Restart your POP3 service
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