Michael answered your question about the firewall but the other part of that is there are two types of spammers. The Spam House and the relayer. The spam house has customers pay them to send mail to people on their mailing lists or ones provided by the customer. These folks have domain names, ISP's and semi human operators. Some times you can complain enough to them that you don't want their mail offerings and they will remove you from their lists. These folks can also be blocked by domain name/ip address.
The second type is the realer. These subterranean creatures use open relays to bomb away. These folks are harder to catch as they will use anyone they can find that's a relayer to sent their mail. It's about impossible to block these folks using domain names/ip addresses as they change the relays they use about as often as I change my socks (daily before you ask). I dislike these weasels the most. > -----Original Message----- > From: Matthew Carpenter [SMTP:[EMAIL PROTECTED]] > Sent: Tuesday, February 26, 2002 2:54 PM > To: MS-Exchange Admin Issues > Subject: RE: spam question > > I have never heard of filtering spam at the firewall. How could a firewall > possibly do that? Unless of course you know who the culprit senders are, > but that changes continuously. > > -----Original Message----- > From: Schwartz, Jim [ <mailto:[EMAIL PROTECTED]>] > Sent: Tuesday, February 26, 2002 12:36 PM > To: MS-Exchange Admin Issues > Subject: RE: spam question > > > It's also a waste of resources as the mail still has to travel through the > firewall, into the IMC, get routed to dev null. Better to block them at > the firewall (if possible) and return them a 5xx error. Dropping the > request (as some do) returns a 4xx error so the mail will queue on their > systems and retry. > > As too why they would have a read receipt is beyond me. Most spammer could > give a damn if their mail gets there or not. They are charging by the > piece sent, not delivered. Spam houses take the add, merge it with a > database of names and open up the mail cannon. Relayers wouldn't want a > receipt anyways. That would give me a way to go after them directly rather > than try to get the open relay to shut his hole. > > > -----Original Message----- > > From: Drewski [SMTP:[EMAIL PROTECTED]] > > Sent: Tuesday, February 26, 2002 1:09 PM > > To: MS-Exchange Admin Issues > > Subject: RE: spam question > > > > Doesn't that violate RFCs? :P > > > > -- Drew > > ******************************** > > Visit <http://www.drewncapris.net>! Go! Go there now! > > Human beings, who are almost unique in having the ability to learn > > from the experience of others, are also remarkable for their apparent > > disinclination to do so. --Douglas Adams > > > > -----Original Message----- > > From: Matthew Carpenter [ <mailto:[EMAIL PROTECTED]>] > > Sent: Tuesday, February 26, 2002 12:03 PM > > To: MS-Exchange Admin Issues > > Subject: RE: spam question > > > > > > > > Depends on what you are running. With my system, I drop mail that > is > > spam, not return it. In such a case, they do not get an NDR, because I > > am deleting their mail. This is a great tool against relay freaks. > > They think their relay is getting through, when in truth, I AM EATING > > IT FOR LUNCH. > > > > -----Original Message----- > > From: Eldridge, Dave [ < <mailto:[EMAIL PROTECTED]>>] > > Sent: Tuesday, February 26, 2002 11:50 AM > > To: MS-Exchange Admin Issues > > Subject: RE: spam question > > > > > > Another question. Don't the spammers know that they have hit a > legit > > address because they don't get a non-delivery notice. Can't they put > > two and two together and figure out which are the real addresses? Why > > would they need a read receipt. just a thought. dave > > > > -----Original Message----- > > From: Anthony Getor [ < <mailto:[EMAIL PROTECTED]>>] > > Sent: Tuesday, February 26, 2002 10:15 AM > > To: MS-Exchange Admin Issues > > Subject: RE: spam question > > > > > > In Outlook 2000, this option is set by going to > > Tools-->Options-->E-mail > > Options-->Tracking Options. > > > > Tony > > > > > > -----Original Message----- > > From: Ropiak Steve - NAO Florence Office IT [ > > < <mailto:[EMAIL PROTECTED]>>] > > Sent: Tuesday, February 26, 2002 4:30 PM > > To: MS-Exchange Admin Issues > > Subject: RE: spam question > > > > > > OutL2000 never asked about sending read receipts, but OutL2002 > does. > > > > > > Steve > > > > -----Original Message----- > > From: Allen Crawford [ < <mailto:[EMAIL PROTECTED]>>] > > Sent: Tuesday, February 26, 2002 10:54 AM > > To: MS-Exchange Admin Issues > > Subject: RE: spam question > > > > > > I wouldn't think so, unless the spammers are coming from your own > > Exchange Server. All I know is that whenever someone from the outside > > world requests a read receipt, I'm usually asked if I want to send it > > or not. Of course, that is with Outlook (Internet Mail Only) and > > Outlook Express at home. I'm not so sure I've ever seen it with the > > Corporate/Workgroup setting... > > > > -----Original Message----- > > From: Eldridge, Dave [ < <mailto:[EMAIL PROTECTED]>>] > > Sent: Tuesday, February 26, 2002 9:45 AM > > To: MS-Exchange Admin Issues > > Subject: spam question > > > > I try to lecture my lusers all the time about not unscribing to > spam > > mail that they are sending their legitimate address back to whomever. > > I tell them to just delete it. Now internally when I send a read > > receipt to someone it will tell me that it was not read. Is this what > > happens when you delete spam? Are they (spammers) still getting a > > notification that it's a real address? > > > > dave > > > > List Charter and FAQ at: > > < <http://www.sunbelt-software.com/exchange_list_charter.htm>> > > > > List Charter and FAQ at: > > < <http://www.sunbelt-software.com/exchange_list_charter.htm>> > > > > List Charter and FAQ at: > > < <http://www.sunbelt-software.com/exchange_list_charter.htm>> > > > > > > > > List Charter and FAQ at: > > < <http://www.sunbelt-software.com/exchange_list_charter.htm>> > > > > List Charter and FAQ at: > > < <http://www.sunbelt-software.com/exchange_list_charter.htm>> > > > > List Charter and FAQ at: > > <http://www.sunbelt-software.com/exchange_list_charter.htm> > > > > > > List Charter and FAQ at: > > <http://www.sunbelt-software.com/exchange_list_charter.htm> > > > > List Charter and FAQ at: > <http://www.sunbelt-software.com/exchange_list_charter.htm> > > List Charter and FAQ at: > http://www.sunbelt-software.com/exchange_list_charter.htm > List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm
