Problem s dorucovanim

[Lubos Kaspar]

> Date: Fri, 7 Sep 2001 08:47:03 +0200 (CEST)
> From: moravcik <moravcik na pal-inalfa.sk>
> To: <sendmail na linux.cz>
> Subject: Problem s dorucovanim
> 
> poradi mi niekto prosim s nasledujucim problemom. Niekolko dni sa nam
> nedari
> odosielat postu do domeny inalfa.nl (a mozno aj inam). Sendmail mi posiela
> nasedovne hlasky (vid dole). Server ktory je tam uvedeny ako Host unknown
> je v ich DNSku uvedeny ako treti s najnizsou prioritou. Znamena to ze sa
> sendmail pokusal spojit najskor s prvymi dvoma a ked sa to nepodarilo ani
> s tretim poslal spravu o chybe? Co znamena na konci riadku 'no data
> known'? Vie niekto kde by mohol byt problem? Spravca domeny inalfa.nl
> tvrdi ze u neho je vsetko O.K.
> 
> 550 <gsenstius na inalfa.nl>,<cgoor na inalfa.nl>... Host unknown (Name server: relay2.nic.unisource.nl.: no data known)

To asi znamena, ze v MX-zaznamu je hostname, ke kteremu neni A-zaznam.

Mne se podarilo pripojit na primarni i sekundarni MX od inalfa.nl
bez problemu, ale na terciarni ne (k jeho jmenu skutecne neni
v DNS A-zaznam):

: # nslookup -q=mx inalfa.nl
: Trying DNS
: inalfa.nl       preference = 50, mail exchanger = relay1.worldonline.nl
: inalfa.nl       preference = 200, mail exchanger = relay2.nic.unisource.nl
: inalfa.nl       preference = 25, mail exchanger = mail.inalfa.nl
: inalfa.nl       nameserver = ns1.worldonline.nl
: inalfa.nl       nameserver = ns2.worldonline.nl
: relay1.worldonline.nl   internet address = 195.241.48.133
: mail.inalfa.nl  internet address = 195.240.56.10
: ns1.worldonline.nl      internet address = 195.241.48.33
: ns2.worldonline.nl      internet address = 195.241.49.33
: # telnet mail.inalfa.nl 25
: Trying...
: Connected to mail.inalfa.nl.
: Escape character is '^]'.
: 220 inal02.worldonline.nl ESMTP Server (Microsoft Exchange Internet Mail Service 5.5.2653.13) ready
: quit
: 221 closing connection
: Connection closed by foreign host.
: # telnet relay1.worldonline.nl 25
: Trying...
: Connected to relay1.worldonline.nl.
: Escape character is '^]'.
: 220 relay1.worldonline.nl ESMTP NO UCE!
: quit
: 221 Bye
: Connection closed by foreign host.
: # telnet relay2.nic.unisource.nl 25
: relay2.nic.unisource.nl: Unknown host
--
                                                Lubos Kaspar