21.října 2008

PC a internet Reverzní DNS záznam

Chybějící reverzní záznam v DNS může způsobit nedoručitelnost emailů. Je to poměrně prosté, ale často se na to při změně providera zapomíná.

Jedná se o tom, že když se náš Exchange server pokouší doručit poštu na jiný Exchange server, tak se mu hlásí svou IP adresou a svým DNS jménem. Protější Exchange server může zkusit ověřit přes tzv. reverzní záznam, zda tato IP adresa opravdu odkazuje na dané DNS jméno. V případě, že reverzní záznam neexistuje nebo je špatně, může Exchange server poštu odmítnout s tím, že se jedná o spam.

Drobná potíž je v tom, že reverzní záznam se nenastavuje u správce naší domény, ale u poskytovatele internetu, který již většinou nemá žádné jednoduché rozhraní pro nastavení.

To zda máte zřízen reverzní záznam pro váš Exchange můžete zjistit takto: (xxx.xxx.xxx.xxx - je externí IP adresa poštovního serveru)

ping -a xxx.xxx.xxx.xxx

Pokud se vám zobrazí:

Příkaz Ping na xxx.xxx.xxx.xxx

nemáte reverzní záznam zřízen.

Pokud se zobrazí:

Příkaz Ping na server.domena.cz

je zřízen příslušný reverzní záznam.

Pozn: V případě, že si nejste jistí s nastavením DNS záznamů nebo Exchange serverem ve Vaší společnosti, je vhodné kontaktovat specializovaného správce sítě.

Hledáte-li správce sítě nebo prostě nekoho kdo umí spravovat servery, hledejte na www.petr-hladis.cz

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