{Disarmed} Re: Listen on different port

Ken Anderson ka at pacific.net
Mon Jan 7 16:56:48 GMT 2008

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? :-)

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