Upon initial invocation of IKJEFLN1, this parameter contains either the value from the previous TSO/E session or the value the user specified on the LOGON command. Upon subsequent entry to IKJEFLN1, this parameter contains the No Mail Option select character entered on the logon panel. You can use this parameter to supply a different No Mail Option select character to the logon panel. The maximum length of this field is one byte. The only allowable values are the character 'S' and ' '. The session receives previously saved mail from the SEND command during logon processing if this option is ' '. The session does not receive previously saved mail from the SEND command during logon processing if this option is 'S'.