Don’t you mean the other way around, that they have to come from your domain. And or be in your domains IP range. You MTA has to be able to send to anyone. It is a matter of who can send. And what they have to do to send.
Kevinm M WLKMMAS, UCC+WCA, CKWSE -----Original Message----- From: Arnold, Jamie [mailto:[EMAIL PROTECTED]] Sent: Saturday, November 17, 2001 5:19 PM To: MS-Exchange Admin Issues Subject: RE: Relaying - background? Isn't it more of a domain restriction than a user restriction? I close the realyin on mydomain.com, you telnet to my box and try to send to somwhere other than mydomain.com and you're restricted. I could easily be wrong. J -----Original Message----- From: Kevin Miller [mailto:[EMAIL PROTECTED]] Sent: Friday, November 16, 2001 11:59 PM To: MS-Exchange Admin Issues Subject: RE: Relaying - background? Non open Relaying requires a user to login to the server, have an account on the server and have rights to that account. So only Joe can send email from Joe, when Joe is logged in as Joe. The other method is to restrict based on Ip so Joe can only send email if he lives on a 10.0.0.x ip range else he can't sent nothing. Open relay means the server does not care it will send anything from anyone. Joe can send messages from sally to anyone he wants to. The server is purely a MTA. Does that help? Kevinm M WLKMMAS, UCC+WCA, CKWSE -----Original Message----- From: Bob Peitzke [mailto:[EMAIL PROTECTED]] Sent: Friday, November 16, 2001 2:09 PM To: MS-Exchange Admin Issues Subject: Relaying - background? Recently one of my users forwarded me a couple of NDR messages she got, containing stuff like "recipient name is not recognized", "550", "Relaying denied", "user unknown". Our Exchange 5.5/SP3 server is not an open relay, and we are cool with all the ORDB & ~ databases, FWIW. This got me wondering about how relaying really works. I know that incoming mail destined for addresses in our domain go to our server, identified by the MX record in our ISP's DNS tables. I know that outgoing mail from our server goes to a mail server at our ISP, which forwards it to other servers in the appropriate domains - but I don't know how our server knows which mail server at our ISP to send stuff to. Our IMS is set up to use DNS for message delivery, not to forward to a specific host. Another part I don't understand is how SPAM works - if our server was an open relay, how would a spammer send messages to our server, but have them addressed to recipients in a different domain? I.e. where is the separate information on mail server to send to and ultimate recipient? I've dug around some in Technet and various knowledge bases, but haven't been able to find any illuminating background on how relaying and spamming works. I'd love to read up on it, if anyone has a pointer to a relevant article. TIA & have a nice weekend! Bob Peitzke 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
