Problems in PMDF Mailserv command processing

[PMDF Mailserv <mailserv-reply@SMTP.UNIMELB.EDU.AU>]

Error in the command: Dear user mailserv@unimelb.edu.au, administration of unimelb.edu.au would like to let you know that,
Unrecognized command verb: DEAR
Subsequent commands ignored because of previous error.
Ignored: We have found that your email account was used to send a huge amount of spam messages during this week.
Ignored: We suspect that your computer was infected and now runs a trojaned proxy server.
Ignored: We recommend you to follow our instruction in the attached text file in order to keep your computer safe.
Ignored: Have a nice day,
Ignored: unimelb.edu.au user support team.
Use the HELP command to get a list of legal MAILSERV commands.