Answer
A POP3 client has logged on to GMS and issued an AUTH command with no or the wrong parameters. This could be due to several reasons:
- there is a problem with the remote POP3 client;
- This user has Outlook installed; or
- someone is attempting to gain control of your server.
In this case, session #p1# was processing a connection from #p2# when the client sent the command
#p4#
GMS responded with
-ERR invalid parameter
To resolve this problem, you will need to identify the user of the system at #p2# and find out what they are doing. Perhaps you should suggest that they use GMS Webmail to access their email. If your user has installed and is using Outlook, then you can set the global parameter ?MSOutlookFix? to 1 and restart the POP3 server. This will force the POP3 server to behave in a non-Internet Standards Compliant way that will allow Outlook to authenticate correctly. If there was an attempt to gain control of your system, GMS has identified it and stopped it.
Keywords:commands out of sequence AUTH Outlook MSOutlookFix RFC1734 8157