High CPU load, RCPT TO:

Drew Marshall drew at THEMARSHALLS.CO.UK
Thu Feb 3 20:23:34 GMT 2005

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Ed Bruce wrote:

> Ok, I've seen a number of answers like this, as long as you use
> sendmail. Well we're using postfix. Does this not work with postfix?


> I
> see that postfix has smtpd_client_connection_rate_limit, but I've got a
> sneaky suspicion it doesn't do anything when using MailScanner or am I
> wrong and this does work???

You are wrong and it works well :-) . What you have to remember is that
MS sits between Postfix's SMTPd and the rest of the Postfix process, so
you can use all of the 'smtpd_' suite of parameters to protect your
machine (Including strict RFC821 envelopes etc) and then what ever gets
through there MailScanner gets!

One of the other things I use to protect against brute force attacks is
smtpd_hard_error_limit which I use to lower Postfix's hard error limit.
So if there is a single client who issues too many errors they are
disconnected after a set number of errors.


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