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Sendmail dictionay checking.

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Yeehaw_woohoo

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Sep 28, 2001, 2:49:37 AM9/28/01
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Hi,

How can i stop spammers from connecting to my sendmail 8.11 server
and check if a user name exists?

Then connect to port 25 and stay there checking every possible
combination of names.

Thanks.

Claus Aßmann

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Sep 29, 2001, 10:36:51 AM9/29/01
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Yeehaw_woohoo wrote:

> How can i stop spammers from connecting to my sendmail 8.11 server
> and check if a user name exists?

You could tell them 250 OK for each address.
Do you want that? I think it's a bad idea...

> Then connect to port 25 and stay there checking every possible
> combination of names.

You can use 8.12 and set

confBAD_RCPT_THROTTLE BadRcptThrottle [infinite] If set and more than the
specified number of recipients in an
envelope are rejected, sleep for one
second after each rejected RCPT
command.
to slow them down.

I use a custom ruleset that invokes sleep(30) for
each wrong user :-)
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