On Wed, 29 Jul 2009 14:22:40 +1000 (EST) Res <r...@ausics.net> wrote:
> >>> Yes, some ISPs deny connections to port 25, but that's why there's > >>> 'submission' service on port 587 where authentication should be > >>> required so any problem with sending spam directly to recipients > >>> is avoided. > >> > >> This is popular in *some* countries, dont assume its a universal > >> thing, because it aint. > > > > This doesn't make sense, when ISPs block outgoing port 25 you can > > use port 587 or 465 to connect to the server of your choice, it > > doesn't > > wrong again, this assumes the ISP enables submission, What do you mean enables submission? They don't have to enable anything, just not block the port. ISP's block outgoing port 25 to prevent direct-to-mx spamming and/or incoming port 25 so they can force people operating servers onto business accounts. An ISP has no reason to block the submission port. > we dont, i've > tested a few very large isp's here and they dont either, so again do > not assume. How would you know? It's outgoing TCP connections that matter. All you can tell from the outside is whether the ISP accepts incoming connections to their own servers.
