[nycbug-talk] How common is blocking outbound 25/tcp? (Re: AsiaBSDCon!!!!)

[Marc Spitzer]

Yup they do that, for a couple of resasons:

1: when you have a large bunch of admin illeterats, normal home users,
there will be a solid chunk that are owned by bots.  So you force them
to funnel their email through your servers and spam/virus check them
and or rate limit them(no you can not send 500 emails/minute).

This prevents you from getting blacklisted, again, mebey.

ok one reason.

marc

On 3/14/07, Andy Michaels <lego at therac25.net> wrote:
> No statistics, only anecdotes here!  I've been on 3 ISPs in the last 10
> years.  2 of them were "big ISPs" and they blocked port 25 outbound a few
> years ago.  CableVision and TimeWarner Cable.  The third was a small,
> local ISP and they let me do just about anything I wanted to do.  They
> also ran FreeBSD :)
>
> Anyway, from my experience, it's pretty common in the states.
>
> -Andy
>
> On Wed, 14 Mar 2007, Yusuke Shinyama wrote:
>
> > Speaking of Japan, although I'm away from admin jobs there for
> > several years, I've heard blocking outbound 25/tcp is fairly
> > pervasive in the most major Japanese ISPs now.  I'm curious how
> > this is common in the US or any other country.  Does anyone have
> > any experience or statistics on this topic?  Googling with the
> > related keywords mostly pops up Japanese pages, but seems like not
> > many US ISPs are doing this... Is there any reason behind?
> >
> > Thanks
> > Yusuke
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