On 2/25/2005 10:51 AM, Nils Ketelsen wrote:
On Thu, Feb 24, 2005 at 11:36:40PM -0500, Valdis.Kletnieks@vt.edu wrote: I force anyone, who wants to relay to use SMTP-AUTH on port 25. Only mails for local delivery are accepted without AUTH. Whats point in opening another port?
There are lots of secondary benefits. One of my favorites is that I can reject mail session on port 25 from hosts that claim to be in my domain (all such mail is authenticated on port 587 or is coming from a pre-configured list of servers that already hit an exception, so any other connections on port 25 that HELO as ehsco.com are lying). There are lots of these kinds of non-trivial benefits. -- Eric A. Hall http://www.ehsco.com/ Internet Core Protocols http://www.oreilly.com/catalog/coreprot/