On Mon, Nov 10, 2008 at 6:59 PM, jfmxl <jfmxl@yahoo.com> wrote:
> My ISP was blocking port 25 outgoing, so I could send mail to my own
> mailserver. It turned out that sendmail was listening on port 587 as
> well, so I use that instead.
>
> I assumed my ISP was blocking outgoing port 25 to stop captured
> machines from spamming. Why do you think yours stopped incoming port
> 25? Probably just easier to block it in both directions?

 My ISP blocks common incoming ports (25, 80) by default, presumably
because they see much more abuse than legitimate use - just think of
the number of people who run mail/www servers over residential
broadband vs the number of people with potentially vulnerable windows
machines. Fortunately for me, my ISP also provides an easy way to turn
the filtering off.
-sqweek