On 07/17/2011 11:24 PM, Always Learning wrote: > *almost* correct. In Linux, like Unix and the pre-Microsoft days, > uppercase letters have a different numerical value to lowercase letters. > > Uppercase 'COM' is definitely not the same as lowercase 'com'. Please correct me if I am wrong but afaik upper-/lowercase does not matter in DNS. Also, I am not aware of e.g. Postfix actually rejecting (with reject_unknown_client_hostname) a FQDN with capitals when a FQDN in lowercase was expected. Regards, Patrick