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Port 587 vs. 25 [was: DNS Hijacking by Cox]
On Jul 23, 2007, at 2:18 AM, Florian Weimer wrote:
* Sean Donelan:On Sun, 22 Jul 2007, William Allen Simpson wrote:Comcast still blocks port 25. And last week, a locally well- known person
They can, but they do not. AFAIK, not a single ISP redirects port 587 to their own servers.
Which is a good thing, since port 587 is usually backed by authentication. Which means you know who sent the mail (or at least which password was stolen to do so). And that is all people are looking for at this level - some way to tell who sent the mail so it can be stopped.
IOW: ISPs have no real reason to stop port 587, they do have a reason (whether you agree it is sufficient or not) to filter port 25.
-- TTFN, patrick