On 23 Oct 2008, at 00:49, MacShane, Tracy wrote:
On 22 Oct 2008, at 12:56, Richard Foley wrote:
...
spam_ip_regex file:
/[ax]dsl.*\..*\..*/i 450 AUTO_XDSL Email Rejected. You appear
to be
This looks fairly useful. Does anyone else have any experience with
this approach, who might be able to offer insight into whether it's
valid or not?
My experience is on the butt-end of such filters - they're a
sure fire way to annoy me if I'm sending you mail.
I run a Postfix server on my home ADSL connection and it is
extremely frustrating to have mail rejected because of that.
The common response of admins to complaints about this is
"you should use your ISP's mail server", but really it is
just nice to have a a proper "receipt" for emails one has sent.
If a message appears undelivered (it may have been
incorrectly have been classified as spam by the recipient's
filter) then, using Postfix & connecting directly, I can say
"the mailserver listed in your domain's MX records
acknowledged receipt for this message at $time on $date;
here's the log entry". If I use my ISP's relay then the blame
is uncertain.
...
I implement those checks as a helo check. If you can't be bothered
having a proper DNS entry for your mail server (ie. not a dynamic
consumer one provided by your ISP), I tend to think it's a bot or at
least a mickey-mouse outfit, and I really don't have to worry too much
about accepting mail from them. However, due to the fact it seems
that a
number of actual businesses can't be bothered getting proper (r)DNS
for
their mail servers...
I do actually have reverse DNS on my hosts, but at the time it was a
pain to get it. Mine is an "above average" ISP, and yet technical
support didn't really know what I was on about - I had to talk them
through running `nslookup` and say "right! so I want it to say
something else there". After a couple of days it was escalated to a
sys admin and a few more days later the DNS records were changed for me.
I think my ISP now allows one to change rDNS in their account web-
admin pages, however I would imagine that there are many competent &
legitimate users who do not have such a facility.
My primary gripe is with admins who use SORBS who classify my subnet
as "dynamic", even though it has been assigned to me for the last 5
years, and who are not co-operative when attempting to use their
"help" system to de-register it. I find just now that fasthosts.co.uk
- who also reject a lot of my mail - require my ISP to re-classify the
IP address as static with the Regional Internet Registries in order to
accept mail from me.
, I've had to relax that attitude a bit, and
fortunately I've found that virtually all can configure a proper HELO
hostname (except for the idiots who install Microsoft Small Business
Server who don't realise you should configure a different hostname to
XXXX.local).
When setting up SBS2003 I was amazed to find that most MS MVPs condemn
use of the brain. They tell administrators "not to be clever" and
advise using the setup wizard throughout the server's whole
installation.
Stroller.
