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    4.7.1 smtp Greylistet in 5 min please try again later – Exchange 2003 SP2

    Greylisting is an anti-spam measure.
    When a new server connects for the first time, the greylisting server sends a SMTP protocol message that says: “Graylistet in 5 min please try again later”.
    The wait time can be different, but usually 5 min.

    The problem is exchange 2003 (with SP2) by deafult only waits for 1 min.
    That has to be changed.

    Create a new DWORD value GlitchRetrySeconds

    Change the Base to Decimal
    Set 360 for 6 min.

    Restart the SMTP service.