Re: People forging their From: addresses

[Rudi van Houten <]

At 17:52 +0200 1/10/98, Piet Beertema wrote:
>    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.

Yet, since the MTA cannot distinguish between "host not found" and "unknown
host, authorative reply nameserver", I give a 4xx error. In case some ugly
sender host is retrying too frequently (every minute or so) I put
temporarily a 551 error for that particular entry in sendmail.cf.
--
Rudi van Houten -- Ac.Comp.Centr.Utrecht/Besturings Systemen
Budapestlaan 8  -  3584 CD  -  Utrecht  -  Netherlands
:-) Fantasy is given mankind to make amends for what he is not,
    and a sense of humour as consolation for what he is.