[exim] Bad Address Syntax

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Autor: Marc Perkel
Data:  
Para: exim users
Assunto: [exim] Bad Address Syntax
Wondering what this means:

220 v185.mailsnare.net ESMTP
helo ctyme.com
250 mail.mailsnare.net
mail from:<>
250 Ok
rcpt to:xxx@???
501 Bad address syntax
rcpt to:<xxx@???>
250 Ok

If I present the email address in <> it works but without the <> it
doesn't. What causes this?