Help! How Can I keep this user from Logging on to my Server?

[SteveZ]

I am using OS X Server v 10.2.8
My email log appears as follows:

Feb 10 2005 16:19:26 SMTP connection attempt for host “saipeople.com” using DNS Cache values.
Feb 10 2005 16:19:26
DNS Cache for Host “saipeople.com” will expire at: Thu, Feb 10, 2005 18:41:57.
Feb 10 2005 16:19:26
SMTP connected to server “saihou25.saipeople.com:25” using TCP/IP to send data for host “saipeople.com”.
Feb 10 2005 16:19:29
SMTP encountered 1 message(s) with errors during message transmission to SMTP Host “saihou25.saipeople.com”.
Feb 10 2005 16:19:29 See Error log for details on each message. All messages will be retried until message expiration.
Feb 10 2005 16:19:29

SMTP closed connection to TCP/IP server “saihou25.saipeople.com”.
Feb 10 2005 16:19:29 Total messages transferred: 0
Feb 10 2005 16:19:29

Total data transferred (k): 1
Feb 10 2005 16:19:29
Total recipients transferred: 1
Feb 10 2005 16:19:29
Total connect time: 00:03

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