Camel Mail CC and BCC headers

Hello All,
I recently had a production issue where there was an exception thrown when
the CC or the BCC headers were set to "":

com.sun.mail.smtp.SMTPAddressFailedException: 554 5.1.1 Invalid recipient
address

Is this the expected behavior in Camel or would it be possible for camel to
check for a blank string and not attempt to set these headers when sending
the email.

Thanks,
Yogesh