North American Network Operators Group|
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Re: Why do so few mail providers support Port 587?
On 2/25/2005 11:17 AM, [email protected] wrote: > department. I'll agree with you on one thing, though -- the whole > business of port 587 is a bit silly overall...why can't the same > authentication schemes being bandied about for 587 be applied to 25, > thus negating the need for another port just for mail injection? It's not just authentication. Mail from local users might need some fix-up work done to it, like adding Date or Message-ID, or completing a mail-domain in an address, or doing some other kind of cleanup. You don't necesarily want to do that for server-server messages, since their absence is good spam-sign, but at the same time you do want to do it for user mail. You can also conduct different kinds of tests, perform different kinds of rate-limiting, map in different headers (auth, for example), and so forth. Separating your traffic is good management. -- Eric A. Hall http://www.ehsco.com/ Internet Core Protocols http://www.oreilly.com/catalog/coreprot/