[Postfixbuch-users] Nachtrag Reverse DNS Entry für Mailserver

Jan Siml jsi at jules.de
Mi Sep 3 10:28:57 CEST 2003

Hallo Ihr,

einer kleiner Nachtrag zur Diskussion.

Aus RFC1912 2.1 (ftp://ftp.rfc-editor.org/in-notes/rfc1912.txt):

"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."

Interessant ist dabei der zweite Satz. Allerdings ist das eine Soll- und 
keine Mußbestimmung. Auf die Konsequenzen eines fehlenden oder inkorrekten 
PTRs wird allerdings hingewiesen.



"The pirate of knowledge is a good pirate."  Michel Serres 

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