[LUNI] Re: sendmail - I have a dirty box
william at scissor.com
Mon Aug 21 10:53:37 CDT 2006
Martin Maney wrote:
> On Sun, Aug 20, 2006 at 12:38:42PM -0700, Ramin K wrote:
>> Adding these sorts of statements to Postfix stops most of this nonsense
>> from getting into your network.
>> smtpd_recipient_restrictions =
> In the best of all possible worlds, this would all be not only
> reasonable, it would be the clearly right thing to do. In the world we
> inhabit, which is but a pale shadow of that utopia, I've seen email
> from real companies that I wanted to receive get caught by some of
> these. invalid_hostname and/or unknown_sender_domain might have been
> the culprits - it's been too long since I last messed with these
> settings, and it's too late to be motivated to check. :-/
If your mail volume is modest, one strategy is to set these to return a
temporary failure. A lot of spammers will only try once, so you skip a
lot right there. Then you can keep an eye on your nightly mail reports
and make exceptions when necessary. You could also probably do something
easy and automated with a whitelist based on outgoing mail info.
I've done that for several years and it has worked pretty well for me.
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