Hi SuzyQ, I think you have the concept correct. "Sender forging' or 'spoofing' is when an email address of an infected computer is replaced with another address, often randomly plucked off the infected computer by the virus. Sender forging is normally done just before the virus sends itself out to more potential victims. By changing the address in the 'Sender' field, no one knows who sent the email or where it came from. " As a result many of the AV auto-responders are automatically sending out the messages, which make it appear that we have been infected. Hopefully we can slow the virus down and educate the members of different groups so that they don't end up putting us on their blacklist<BG> Mike ~ It is a good day if I learned something new. Editor MikesWhatsNews see a sample on my web page http://www.mwn.ca/ UPDATED 22/08/03 See my Anti-Virus pages UPDATED 22/08/03 <http://www3.telus.net/mikebike/mikes_virus_page.htm> <virusinfo-request@xxxxxxxxxxxxx?Subject=subscribe> A Technical Support Alliance Charter Member *********** REPLY SEPARATOR *********** On 22/08/2003 at 8:28 PM SuzyQ wrote: First -- thanks for such a speedy reply! ;-) Second -- I probably should have changed the subject header on this message, but didn't as my problem was also concerning messages sent to a Yahoo! group. I'm really glad to get this info. Not real sure it answers my problem as the messages I get back say that my posts were undeliverable to Yahoo! and it includes any text I wrote in the initial message. minus the attachments of course. Some of the posts which weren't supposed to have been posted did make it to the group, but most have not shown up in the archive list at Yahoo! yet. So, what you are saying is that these messages from 'postmaster' -- even though they say nothing about my computer being infected & just that my post was undeliverable -- could in fact be messages sent out by someone else's computer which does have the virus? Did I understand this correctly? Thanks, again! Although I'm mainly a lurker here, I have learned a great deal from the group and appreciate everyone of you that help the rest of us out in our confusion. ;-) SuzyQ For a web-based membership management utility and information on list policies, please see http://nibec.com/24hoursupport/ To unsubscribe, send a blank email to 24hoursupport-request@xxxxxxxxxxxxx with "unsubscribe" (without quotes) in the subject.