Blocking spam

Bill Becker bbecker at
Thu Jun 19 10:42:23 UTC 1997

On Wed, 18 Jun 1997, Brian Horvitz wrote:

> Can someone give me a clue on filtering mail on using the stock sendmail
> that comes with Solaris?  I am unfortunately without a sysadmin right now
> (anyone need a job?) but I do know enough to monkey with what needs
> monkeying.  Anyway, a certain user decided to dial up (to somewhere
> else) and use my mail system to send mail to every single AOL user.  Today

First upgrade to sendmail 8.8.5 (or try 8.8.6) and then take a look at:

> alone I probably got about 600 copies of his bounced mail...never mind
> that this is deffinately not cool.  Anyway, I have the email address that
> he is using as for the FROM: field so I'd like to simply block that out.
> Help would be appreciated.

You also need to prevent people from using your server as a relay.  If 
you don't, you are doomed.


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