{Disarmed} Re: Listen on different port

Scott Silva ssilva at sgvwater.com
Tue Jan 8 17:12:03 GMT 2008

on 1/7/2008 8:56 AM Ken Anderson spake the following:
> Gerard wrote:
>> On Mon, 07 Jan 2008 10:18:46 -0600
>> Ken Anderson <ka at pacific.net> wrote:
>>> You really should relay out through your ISP's mailserver. Your ISP
>>> will not be blocking port 25 incoming, so your listening sendmail on
>>> port 25 should be able to receive mail from the Net just fine. Your
>>> ISP's block on port 25 outgoing will not be worked around by setting
>>> up your sendmail to listen on an additional port. You need to set
>>> smart host in your sendmail.mc and rebuild sendmail.cf.
>> Comcast, at least in selected markets, has been blocking port 25 both
>> in & out. In fact, they are enforcing TLS/SSL on port 587, again in
>> selected markets. Actually, it is not such a bad idea if it stops
>> 'bots' from sending SPAM.
> Enforcing TLS on AUTH date makes sense, but why block port 25 incoming? 
> There are no bots that deliver directly to end users. Is MS messenger 
> now listening on port 25? :-)
> Ken
> Pacific.Net
Because these ISP's sell "business" accounts that cost more. They consider 
anyone who runs any outside reachable service in violation of their use 
contracts unless you pay 3 to 5 times more for one of these business 
contracts. And it is a lot easier to stop all traffic on a port across your 
system then to selectively track down the offenders.

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