Re: difference between

Philipp Snizek wrote:
> Hi
>
> what is the exact difference between
>
> reject_invalid_hostname
> Reject the request when the client HELO and EHLO command has a bad
> hostname syntax. The invalid_hostname_reject_code specifies the
> response code to rejected requests (default: 501).
>
> and
>
> reject_non_fqdn_hostname
> Reject the request when the hostname in the client HELO (EHLO) command
> is not in fully-qualified domain form. The non_fqdn_reject_code
> specifies the response code to rejected requests (default: 504).
>
> from my point of view invalid hostname = non fqdn hostname. Or does
> invalid hostname look like %*827z5///.mydomain><.com ?


reject_non_fqdn_hostname rejects a helo that is either invalid
(reject_invalid_hostname) or one that is valid but has not dot (such as
"blahblah", in contrast to "blah.blah").

so reject_non_fqdn_hostname includes reject_invalid_hostname. you
provided an example of the latter, but worst would be a heloname that
tries to "poison" the Received headers (by using parens for instance).