[LINK] BigPond goes Static
cas at taz.net.au
Wed Jan 21 17:06:45 EST 2004
On Wed, Jan 21, 2004 at 12:44:45PM +1100, Ash Nallawalla wrote:
> > On Tue, Jan 20, 2004 at 03:54:53PM +1100, Ash Nallawalla wrote:
> > > I have located people with fixed IP addresses because their email
> > > headers over time are unchanged.
> > people don't have fixed IP addresses. machines do.
> I know. The ones I referred to are companies whose networking regime is known to
> me (fixed IP addresses). While that CEO's secretary or wife may well surf the web
> from his PC and know his password, I don't think she would visit my site from his
people don't have IP addresses. machines do. assuming otherwise is a mistake.
> > at the very least, you should understand the limitations of what you are
> > doing and not be surprised - or upset - when your mail gets rejected
> > because it is coming from a dynamic IP address....because it WILL get
> > rejected for that reason. there is just too much spam and too many viruses
> > coming
> Why shouldn't I be surprised?
because many sites do not accept mail direct from dynamic IP addresses. They
use DUL RBLs or other methods to identify connections from dynamic addresses.
> I am *trying* to understand Outlook 2003 and its "limitations", (oh woe is
> me, it is not Open Source). The above test suggests that it checked the DNS
> and didn't bother to send it to my SMTP gateway.
> To use a supposedly cooler mail client, Agent, doing the same results in a
> popup stating a 450 error, not a bounce email. I can't replicate the error
> with the blacklisted address.
it has nothing to do with the client. mail from dynamic ip addresses will be
rejected regardless of whether it's sent by a mail user agent like
outlook/eudora/mutt etc or a mail server such as postfix or sendmail or
4xx error codes indicate "temporary failure, try again later". Outlook should
NOT bounce a message on a 450 error, it should put the message back in the
outbound queue ("Outbox" or whatever it's called) and optionally alert the user
with a popup dialog.
> So, to extrapolate, Netspace did such a good job by using the black list to
> manage its outbound mail, that it blocked me from sending an email to its own
that's dumb. they should know their own IP address ranges, so they should
easily be able to exclude them from RBL checks - that's standard procedure for
any ISP (or other mail server) using any of the RBLs.
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