[ILUG] Eircom -v- IOL,
or just Eircom practicing the best of spam management,
and blacklisting themselves.
jm at jmason.org
Tue Apr 27 17:42:57 IST 2004
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David O'Callaghan writes:
> On Tue, 2004-04-27 at 12:07, Enda wrote:
> > Details of a bounced message received from an eircom customer emailing an
> > IOL.ie customer, seems like Eircom's MTA can't send the message because its
> > decided for "spamcop" reasons it can't talk with its own mail relay. Well
> > done Eircom!!
> Hang on, this looks like IOL are blocking Eircom (based on pretty
> dubious information).
> > > 22.214.171.124 does not like recipient.
> > > Remote host said: 550-Blocked - see
> > http://www.spamcop.net/bl.shtml?126.96.36.199
> > > 550 mail from 188.8.131.52 rejected: administrative prohibition (host is
> > blacklisted)
> > > Giving up on 184.108.40.206.
> That is, 220.127.116.11 (hub01.mail.iol.ie) is refusing to deliver mail
> received from 18.104.22.168 (mail07.svc.cra.dublin.eircom.net) because
> of a Spamcop report about it. Eircom are guilty of the following
> terrible crimes:
> * Been reported as a source of spam less than 10 times
> * Been detected sending mail to spam traps
> * Been witnessed sending mail about 5290 times
> Knowing that this server belongs to a widely-used ISP (with it's fair
> share of virus-riddled and otherwise clueless users), none of these
> things is particularly surprising.
Yep. Using Spamcop's blocklist as an "all or nothing" blocklist, means
that you will have "issues" with hair-trigger blocks like this, due to
over-sensitivity in how they decide whether to block or not. It's a
pretty common occurrence, reportedly.
I wouldn't recommend using the Spamcop BL in the MTA list of "block on
sight" DNSBLs, where a Spamcop false positive will cause bounces. Leave
that up to "safer" ones like Spamhaus SBL/XBL, and only use Spamcop inside
a more balanced system like SpamAssassin. ;)
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