[nzlug] Domain of sender address does not exist?

[Mark Foster]

On Fri, 21 Sep 2007, Johann Schoonees wrote:

>
> Mark Foster wrote:
>> 
>> But there is no excuse for not using a real, valid domain name.
>
> Are you saying my hostname should be the same as the domain name hosted for 
> me by my ISP?
>

I'm saying the email address that your email is seen to come from (however 
it may be created) should be valid (by virtue of being 
@a-domain-that-exists-and-has-an-MX) and ideally should be checked. This 
means you'll see bounces.

I'm not suggesting it should be any particular domain - though if you own 
one, it'd seem clever to perhaps use a subdomain of it for your home 
system....

to give you an example,

My Colo's hostname is maverick.blakjak.net, which has a valid MX (no MX 
for the subdomain 'maverick' but a valid A record for maverick exists; 
this host runs an MTA.)  If an email generated by 
$DAEMON at maverick.blakjak.net is pushed out to the internet, the domain is 
going to pass any (sane) checks as to its validity.

HTH

Mark.