Answer
A remote user has successfully logged on to GMS’s POP3 server. Therefore GMS has authenticated this IP address for sending email through SMTP for a period of time. This means that the remote user can now send email just as if they were sitting in the local office. This option is part of GMS Anti-Spam.
In this case, session Undefined has authenticated the system at Undefined for relaying email through the local SMTP server.
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Keywords:POP before SMTP authentication 8138