Hi, To my knowledge, Mail Relay is SMTP server forwording the email which source don't belong to its client or domain. For example, [EMAIL PROTECTED] want to send mail to his friend. By default, [EMAIL PROTECTED] require to specify its STMP server under abc.com domain ie SMTP server under abc.com domain. If [EMAIL PROTECTED] specify its SMTP server as xxx.def.com and xxx.def.com SMTP server allow this email to forward its to global interenet, then xxx.def.com is doing mail relay...
In conclusion, all the email client in the world can send mail to their friend as long as they specific their SMTP server as xxx.def.com...which causing spamming... Thus, to prevent mail relay, SMTP server should check the source domain before forwarding the email out... Do correct me if i am wrong. Rgds, Sam -----Original Message----- From: Viet Tran [mailto:[EMAIL PROTECTED]] Sent: Thursday, May 30, 2002 4:19 AM To: [EMAIL PROTECTED] Subject: RE: Mail Relay [7:45144] Nobody knows ?? Can anyone tell me what is a mail relay for ?? ------------------------------ In a typical mail flow, a source mail client sends message to its mail server. This mai server then directs the message to its nearest mail relay, then to next mail relay, then to the next-next ... until the message reaches the mail server at the other end to be delivered to the destination mail client. ---------------------------------- I know it is not a Cisco issue, but for me it is related to the fact that I am only studying cisco stuff and therefore do not know anything about those kind of Microsoft things. ------------------------------- Actually it's not Microsoft or whatever thing, but should be called SMTP thing. However, the majority of mail relay boxes out there implement their relay job running sendmail, an integrated GNU software found in every Unix machine including Linux of course. Maintaining sendmail is challenging, but very rewarding. You can start by reading DNS & BIND and Sendmail of O'Reilly, then jumping to Sendmail Theory & Practice of someone I don't recall the name right now. ----------------------------- Hope it helps little bit. Regards, Victor Tran. Santa Clara County ISD. __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=45406&t=45144 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
