Am 29.08.2012 13:34, schrieb Wietse Venema: > Please run the attached programs ON THE AFFTECTED MACHINE. They > show what Postfix gets from your libc routines. > > ./getnameinfo ipaddr > ./getaddrinfo hostname (once for each result from getnameinfo).
So it's indeed the system resolver ... see the missing fifth PTR and instead returning "not known". Basic Debian squeeze, no nscd or funky NSS modules loaded. postmaster@lxmhs51:~$ ./getnameinfo 134.130.87.26 Hostname: zulu.geotechnik.rwth-aachen.de Address: 134.130.87.26 postmaster@lxmhs51:~$ ./getnameinfo 134.130.87.26 Hostname: geotechnik.rwth-aachen.de Address: 134.130.87.26 postmaster@lxmhs51:~$ ./getnameinfo 134.130.87.26 Hostname: forestdnszones.geotechnik.rwth-aachen.de Address: 134.130.87.26 postmaster@lxmhs51:~$ ./getnameinfo 134.130.87.26 Hostname: domaindnszones.geotechnik.rwth-aachen.de Address: 134.130.87.26 postmaster@lxmhs51:~$ ./getnameinfo 134.130.87.26 getnameinfo 134.130.87.26: Name or service not known postmaster@lxmhs51:~$ ./getaddrinfo zulu.geotechnik.rwth-aachen.de Hostname: zulu.geotechnik.rwth-aachen.de Addresses: 134.130.87.26 postmaster@lxmhs51:~$ ./getaddrinfo geotechnik.rwth-aachen.de Hostname: geotechnik.rwth-aachen.de Addresses: 134.130.87.26 postmaster@lxmhs51:~$ ./getaddrinfo forestdnszones.geotechnik.rwth-aachen.de Hostname: forestdnszones.geotechnik.rwth-aachen.de Addresses: 134.130.87.26 postmaster@lxmhs51:~$ ./getaddrinfo domaindnszones.geotechnik.rwth-aachen.de Hostname: domaindnszones.geotechnik.rwth-aachen.de Addresses: 134.130.87.26 I think we can safely get back to the sender and tell him that he should fix his DNS. Nothing postfix can be blamed for. Sorry for the noise. Regards, Bernhard
