thanks fabian for your answer..
but i have been do it..and if i run the syntax
root@PCrouter:/etc/mail# m4 sendmail.mc>  sendmail.cf
nothing happened.
what should I do again?
but thanks for the answer with my problem..

Dari: Fabian Wenk <fabian@wenks.ch>
Kepada: fail2ban-users@lists.sourceforge.net
Dikirim: Minggu, 29 April 2012 17:15
Judul: Re: [Fail2ban-users] sendmail on fail2ban not working

Hello Rudy

On 29.04.2012 09:15, Rudy Rinaldi wrote:
> if I run the syntax
> root@PCrouter:/etc/mail# m4 sendmail.mc>  sendmail.cf
> i have got the results
> *** ERROR: FEATURE() should be before MAILER()
> *** MAILER(`local') must appear after FEATURE(`always_add_domain')*** ERROR: FEATURE() should be before MAILER()
> *** MAILER(`local') must appear after FEATURE(`allmasquerade')*** ERROR: FEATURE() should be before MAILER()
>
> whats wrong with my configuration?
> thanks for your help..

This is a configuration error in Sendmail and not fail2ban. Check
the order in your /etc/mail/sendmail.mc file, the lines with
FEATURE should be before the lines with MAILER. Fix it and try
the above command again.


bye
Fabian

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