Hi,My friend
Thank you for Benny Pedersen and Noel Jones answer
I will try to install fail2ban to stop them next time
By the way The IP 5.39.219.175 is too bad
I just put it into hosts.deny
Thanks a lot
TOM
2012/9/25 Noel Jones <njo...@megan.vbhcs.org>
> On 9/25/2012 8:56 AM, Feel Zhou wrote:
> > /var/log/maillog
> > Sep 24 08:37:50 shcx postfix/smtpd[14960]: warning:
> > unknown[5.39.219.175]: SASL LOGIN authentication failed:
> > authentication failure
> ...
> >
> > Hello My friend
> > Someone who want to guess username and passwd in my mail server
> > What I think is, In one minute only one or two users can use
> > sasl auth
> > How can I set main.cf <http://main.cf> in postfix to stop this
> > happen
> > Thanks for your time
> > tom
> >
>
>
> Use fail2ban or similar to automatically firewall clients who make
> too many login failures. Postfix has no such built-in features.
>
>
>
>
> -- Noel Jones
>
