5.5.0 smtp;501 Syntax error in parameters or arguments

I'm getting a reply from the server with the following error:

5.5.0 smtp;501 Syntax error in parameters or arguments.

Thanks for all the help in advance.
chottoedAsked:
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SembeeConnect With a Mentor Commented:
1 user only gets this error message? All domains or just one particular email address?
No others?

What happens if the user sends a message via OWA? Same error?

Simon.
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SembeeCommented:
Exchange and Windows version please?
Anything between your mail server and the Internet? Firewall, AV, anything like that?

Simon.
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chottoedAuthor Commented:
exchange 2000 with a pix firewall. But, This only happens to 1 user. I was able to send and receive to that email address.

Thanks.
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chottoedAuthor Commented:
1 user gets this error only. I'll ask her to try OWA. thanks.
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hospiceccCommented:
I am having that same issue but all of my user can not send to @yahoo.com/ @aol.com or @hotmail.com domains.  I am running MS Exchange 2000.  I have a symantec firewall box.  Can you help me?
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SembeeCommented:
hospicecc - this is a closed question.
Please post a new question where it will be picked up and answered.

Simon.
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