On Sat, 2016-10-08 at 14:06 +0300, Lena@??? wrote:
> Honest users send non-spam messages from dynamic IP-addresses.
But do those "honest" (better: "genuine") users have:-
(1) rDNS ? Probably not because it is a dynamic IP address with a host
name, if a host name actually exists, like
123-123-123-66.dymanic.example.net
(2) A HELO/EHLO name which resolves to the IP address being used ?
Probably not.
How can the "honest" receivers of emails (MTA sites) distinguish (or
separate) the "honest" incoming traffic from the usual flood of
"dis-honest" traffic sent from the same range of IP address ?
Why are "honest" users with dynamic IP addresses, unable to route their
outgoing email traffic via a smarthost or via a very cheap VPS running
MTA software like Exim ? VPS's usually have between 1 and 8 fixed, or
static, IPv4 addresses plus the ability to create DNS records such as A
and MX.
> Those dynamic IP-addresses often are in blacklists.
Because mail admins, like me for example, are unhappy at the vast amount
of spam originating from ranges of dynamic IP addresses. After a while,
we block hosts like
*airtelbroadband.in
*adsl.alicedsl.de
*dynamic.se.alltele.net
*alshamil.net.ae
*adsl.anteldata.net.uy
*aphie.info
*pools.arcor-ip.net
*static.arcor-ip.net
*as9105.com
*as13285.net
*as43234.net
et cetera, et cetera.
*host..
*dyn.....
etc.
plus the commercial spammers. For example
*descene.org # 29 Dec 2014 : Ebay junk mail
*dmdelivery.com # Chinese junk mail
*dnsinspect.com
*edmspread.com # Chinese junk mail : 17 Sept 2015
*emsmtp.com # Chinese junk mail
*emsmtp.us # Ebay spam 12 April 2016
*everydayedeals.com # 21 May 2015
*glassdoor.com # 20 Sept 2015
mout-xforward.gmx.net
*imtreview.com # 02 March 2016
*mailgun.net # 15 April 2015, Rackspace service
*mailgun.us # ditto
*mailminion.net # 17 May 2016
*mandrillapp.com # MailChimp
*mcsv.net
*mkt7162.com # IBM spam
*mmsvr.net # 17 May 2016
*msgfocus.com # = Adestra Ltd, email newsletter and
marketing services
*myfanbox.com # 27 August 2014
*postageapp.com # 25 November 2014 : commercial email
sender
*respread.com
*respread.net
*rk-mail.com # Centos abuse
*rnmk.com # Oracle spam for Nikon
*rsbn2.com
*rsgg1.com
*rsgog.com
*rsgsv.net
*rsp-apn2.com
*rsp-apn8.com # Reasonables 01 Dec 2015
*rspmail-apn1.com # 4 May 2016
*rspmail-apn2.com # 17 May 2016
*rspmail-apn3.com # 14 May 2016
*rspmail-apn4.com
*rspread.net
*spread2.com
*spread2.net
*sslsonar.org # scanner.sslsonar.org
*strim.net.ua # 13 Mar 2016.
etc.
--
Regards,
Paul.
England, EU. England's place is in the European Union.
