Your first question is the exact same as your original question. What is in the displayed TO and FROM field are not what is in the envelope. Here is the header of your post I am responding to minus the processing server information: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="=_reb-r1B2EC8CF-t42D6EE81" Subject: [exchangelist] RE: spam question(OT) Date: Thu, 14 Jul 2005 18:59:52 -0400 Message-ID: <***********************-1663212-506308-2005.07.14-17.00.25--johnlist#eservi cesforyou.com@xxxxxxxxxxxxx> Thread-Topic: [exchangelist] RE: spam question(OT) Thread-Index: AcWIuF1Rzsc4K4piRsq6RucZK3UcxgACXBgRAAFbQNA= From: "Kern, Tom" <tkern@xxxxxxxxxxx> To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx> List-Unsubscribe: <mailto:$subst('Email.Unsub')> Reply-To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx> Now, you will notice that it says FROM you TO the ExchangeList. (I have removed some other lines that indicate processing or formatting but are not needed for this discussion.) That is what you are seeing in your e-mail client, as well as I am. However, the following is the information on FROM and TO from the envelope of that very same message to me: X-Note: #### Sender is bounce-exchangelist-1663212@xxxxxxxxxxxxx and spool file is DEED8034500000353.SMD X-RCPT-TO: <johnlist@xxxxxxxxxxxxxxxxxxx> Those lines are taken directly from the envelope that the sending e-mail server (in this case lyris.webelists.com) presented to my e-mail server. (Those lines are added to the message header by the software I use, however that exact same information will be in the SMTP logs depending on how logging is configured.) As for your second question, do you see the last line of the message header that starts with Reply-To? That determines what happens when you hit reply. Some lists are configured to reply to the list, some are configured to reply to the sender. It depends largely on what is the purpose of the list. John T eServices For You -----Original Message----- From: Kern, Tom [mailto:tkern@xxxxxxxxxxx] Sent: Thursday, July 14, 2005 4:00 PM To: [ExchangeList] Subject: [exchangelist] RE: spam question(OT) http://www.MSExchange.org/ oh and as a follow up to this question, out of curiosity, when an email comes from a mailing list like this, how does a mail server like exchange know to expand the list and how does it still keep the list in the TO: field? Some lists i'm on don't do that and when you hit "reply" you reply to the sending user instead of the list. just wondering how that works. thanks a lot! this list is really very good, btw. thanks for all your help