On Fri, 18 Apr 2008, Jaroslav Votruba wrote:
> Postak mi blokuje maily z jedne firmy na zaklade toho, ze nesouhlasi dopredny
> a zpetny zaznam v DNS.
> Coz blokuji kvuli spamu.Jejich spravce mi tvrdi, ze ma vse v poradku, ze
> pouzivaji jednu IP pro prijem a jinou pro odesilani posty a ze to maji v
> poradku.
> Ja mu oponuji, ze by hostname mailserveru a IP mela byt v poradku na DNS,
> teda alespon ta pro odesilani.
To, ze pouzivaji jednu IP pro odesilani a jednu IP pro prijem posty neni v
zadnem vztahu s tim, zda maji v poradku (konzistentni) dopredne a reverzni
zaznamy k danym IP adresam.
Meli by si to dat do poradku, pokud se chteji vyhnout problemum toho typu,
ktery popisujete.
RFC1912: Common DNS Operational and Configuration Errors
------------- cut -----------
2.1 Inconsistent, Missing, or Bad Data
Every Internet-reachable host should have a name. The consequences
of this are becoming more and more obvious. Many services available
on the Internet will not talk to you if you aren't correctly
registered in the DNS.
Make sure your PTR and A records match. For every IP address, there
should be a matching PTR record in the in-addr.arpa domain. If a
host is multi-homed, (more than one IP address) make sure that all IP
addresses have a corresponding PTR record (not just the first one).
Failure to have matching PTR and A records can cause loss of Internet
services similar to not being registered in the DNS at all. Also,
PTR records must point back to a valid A record, not a alias defined
by a CNAME. It is highly recommended that you use some software
which automates this checking, or generate your DNS data from a
database which automatically creates consistent data.
------------- cut -----------
Vlasta
> tohle je vypis host a logu
>
> [EMAIL PROTECTED] host 193.222.130.1
> 1.130.222.193.in-addr.arpa domain name pointer okmail.oksystem.cz.
> [EMAIL PROTECTED] host okmail.oksystem.cz
> okmail.oksystem.cz has address 193.222.130.65
>
>
> Apr 18 10:30:50 postak postfix/smtpd[76414]: warning: 193.222.130.1: address
> not listed for hostname
> okmail.oksystem.cz
> Apr 18 10:30:50 postak postfix/smtpd[76414]: NOQUEUE: reject: RCPT from
> unknown[ 193.222.130.1]: 450 Client
> host rejected: cannot find your hostname, [193.222.13
> 0.1]; from=<[EMAIL PROTECTED]> to=<[EMAIL PROTECTED]> proto=ESMTP
> helo=<okmail .oksystem.cz>
>
>
>
> kdo ma pravdu?
>
--
Vlastimil Zeman
System Administration Manager
VOLNY (Telekom Austria Czech Republic, a.s.)
U Nakladoveho nadrazi 8
130 00 Praha 3, Ceska Republika
Tel.: +420 246 000 408
Fax : +420 246 000 118
mailto:[EMAIL PROTECTED]
http://www.telekomaustria.cz
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