System.Net.Mail.SmtpClient.Send() Error: An invalid character was found in the mail header.

I've had nothing but trouble from the System.Net.Mail objects, but I
finally need to make them work, and I can't for the life of me see what
I'm doing wrong.

I pared back my mail transaction to the bare minimum:

System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("<my
mail server IP>", 25);
smtp.Send("<one of my email addresses>", "<another of my email
addresses>", "Hello", "World");

And on the smtp.Send() command I get back a SmtpException {"Failure
sending mail."}, {An invalid character was found in the mail header.}.

An inspection of the MailMessage object (before I simplified that away)
showed that there were no items in the header before this exception. A
packet trace during the exception shows that the SMTP server responds
properly and the object immediately replys with a "QUIT".

I would greatly appreciate any insight that could be offered.
Thanks,
Andy

.

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