Prev-20 Home Next-20 6 msg DSN relay host 1 msg Restrict sender and from to one domain on outbo... 10 msg Outbound postfix routing issue Problem with Black List \ Sasa (7 May 2008) . \ Ralf Hildebrandt (7 May 2008) . \ Sasa (7 May 2008) . . \ Ralf Hildebrandt (7 May 2008) . . . \ Arturo 'Buanzo' Busleiman (7 May 2008) . . . \ mouss (7 May 2008) . . \ Sasa (8 May 2008) . . . \ Bill Cole (8 May 2008) . . . . \ mouss (8 May 2008) . . \ Sasa (9 May 2008) . . . \ mouss (9 May 2008) . . . \ Bill Cole (9 May 2008) . \ Sasa (7 May 2008) . \ Sasa (7 May 2008) . . \ mouss (7 May 2008) . . \ Bill Cole (7 May 2008) . \ Sasa (7 May 2008) . . \ mouss (7 May 2008) . \ Sasa (8 May 2008) . . \ mouss (8 May 2008) . \ Sasa (8 May 2008) . . \ Arne Hoffmann (8 May 2008) . . \ mouss (8 May 2008) . \ Sasa (8 May 2008) . . \ mouss (8 May 2008) 3 msg Looking at new mail server layout 26 msg why every minute: 'reload configuration /etc/po... 2 msg myhostname parameter 17 msg RBL problems with smarthost on private address ... 34 msg Backscatting filter? 3 msg how to setup postfix in 'deliver-only' mode? 7 msg Slow queue configuration 17 msg Some Windows SMTP Server have problems with STA... 5 msg For each check_ns or each check_mx, the value i... 4 msg postfix and spf 2 msg Password Validation in postfix 4 msg catching some spam with warn_if_reject and reje... 9 msg RFC: Check mail quota at a mail relay (backscat... 31 msg GPS vs GLD (greylisting) 3 msg Unmeant update from 2.2.10 to 2.5.1 27 msg mailq lockups Prev-20 Home Next-20

Prev-Msg Prev-Thread Postfix-users May-2008 Next-Thread Next-Msg Subject: Re: Problem with Black List Group: Postfix-users From: Bill Cole Date: 7 May 2008 At 8:16 PM +0200 5/7/08, Sasa imposed structure on a stream of electrons, yielding: >Hi, I am concordant about 'generic rDNS' that must to solved but I >have two dubious: > >- why this problem is occasionally ? if the dns resolution is >incorrect is always incorrect >- why in on the same time that mail is blocked the IP ins't listed on CBL ? Another possibility is that the site that is getting the bad lookup is using a DNS server that is telling intentional lies. There has recently been a spreading trend among ISP's of using their customer-facing DNS resolvers to generate revenue by returning A records pointing to their own special webservers in place of any NXDOMAIN results that they get when resolving customer A queries. This means that an error in the hostname part of a URL put into a web browser gets a pretty page from the ISP's site explaining the mistake, usually along with ads, correction suggestions, and a search form. Sites that have chosen to conserve their resources (arguably unwisely) by using their ISP's resolvers rather than running their own honest ones and who do not specify the result indicating a listing (i.e. 127.0.0.2 for simple DNSBL's) in their configuration can end up rejecting mail as a result, because they see any result as a listing. -- Bill Cole bill Prev-Msg Prev-Thread Postfix-users May-2008 Next-Thread Next-Msg

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