Re: People forging their From: addresses
- Date: Fri, 02 Oct 1998 14:44:32 MET-DST
> 1) If DNS really returns "NonExistant Domain"
> you MAY return 5xx.
...and you might want to think twice or check more than once :-)
In the (not so rare) cases where *all* NS servers for a certain domain
are lost for a while (e.g. due to connetivity problems), you would then
bounce perfectly valid mail.
>The cost of 4xx is large log files - in my opinion that's cheap
>compared to legitimate mail being refused and returned.
On that aspect Piet commented:
= The cost of 4xx is large log files
=If that were the only cost, I could live with it and
=turn on 4xx by default. But it isn't the only cost:
=each of the numerous retries costs you resources.
While I certainly agree that loosing all NSs for a domain is not a
good idea, it is simply a reality. And dealing with it and explaining
to the end-users what's happening and why is costing the most expensive
resource: the human resources at the help-desk ;-)
Wilfried
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