North American Network Operators Group|
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical
Re: Why do so few mail providers support Port 587?
On 2/25/2005 10:51 AM, Nils Ketelsen wrote: > On Thu, Feb 24, 2005 at 11:36:40PM -0500, [email protected] 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/