Nikolas Kallis:
> Hello,
>
>
>
> I have an issue with spam. To tackle the issue, I am going configure my
> Postfix-based SMTP server by enabling 'reject_non_fqdn_helo_host name',
> which will reject mail from clients that are not using a FQDN as their
> host name (such as 'localhost').
>
> After reading Postfix's documentation on how to do this, I have a
> concern and hoping someone can help me out. Postfix's documentation says
> the following for 'reject_non_fqdn_helo_host name':
>
> "Reject the request when the HELO or EHLO host name is not in
> fully-qualified domain form, as required by the RFC."
>
> What the documentation says is incorrect. Under '3.6 Domains' of RFC
> 2821, it says a host name can be an address literal. So, if I use
> 'reject_non_fqdn_helo_host name' and a SMTP client uses an address
> literal for its host name, will Postfix reject the mail?
Of course not.
Wietse
