postfix fails to install when domain has only digits

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Binary package hint: postfix

jaunty kubuntu postfix fail to install apt-get install postfix

ProblemType: Package
Architecture: i386
DistroRelease: Ubuntu 9.04
ErrorMessage: subprocess post-installation script returned error exit status 75
NonfreeKernelModules: nvidia
Package: postfix 2.5.5-1.1
SourcePackage: postfix
Title: package postfix 2.5.5-1.1 failed to install/upgrade: subprocess post-installation script returned error exit status 75
Uname: Linux 2.6.28-11-generic i686

[Bart de Koning (bratdaking)]

Same error on my machine.
it looks like postfix cannot handle a hostname that consists of only numbers

sudo dpkg --configure postfix
Instellen van postfix (2.5.5-1.1) ...

Postfix configuration was not changed. If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed. To view Postfix configuration
values, see postconf(1).

After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.

Running newaliases
newaliases: warning: valid_hostname: numeric hostname: 0111055
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad parameter value: 0111055
dpkg: fout bij afhandelen van postfix (--configure):
 subproces post-installation script gaf een foutwaarde 75 terug
Processing triggers for libc6 ...
ldconfig deferred processing now taking place
Fouten gevonden tijdens behandelen van:
 postfix

[Bart de Koning (bratdaking)]

As the whole issue is solved if I change my hostname from 0111055 to D0111055 I guess I was right.

A little look in the original bug shows by the way another strange behaviour: his name contained a . -> as a hostname postfix only handles the part after the . which was only a number...