I am running an Exchange 5.5 Enterprise with sp4 on a win2k server. It is a single site, single exchange server in a mixed mode NT4 domain. I usually have a bunch of outbound messages stuck in the "Outbound awaiting delivery" with no Originator header going towards various spam related websites. I manually delete hundreds of these out of the que several times a day. Is there a way to configure the exchange server not to accept any email which has no Originator information? I have relaying shut down tight. I assume that these emails are the result of either a virus on an infected pc here on our network or pc's with spyware loaded accidentally on them or something of this nature. If there was a way to lock down the exchange server, is there a downside to this action? thanks, Greg CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential information and privileged information. Any unauthorized retention, review, printing, copying, disclosure or distribution is prohibited. If you are not one of the intended recipients, please contact the sender by reply email or phone, destroy all copies of the original message and keep the information contained here confidential.