On Mon, Oct 16, 2017 at 7:32 AM, Maurizio Caloro <mauri...@caloro.ch> wrote:
> Hello Together
> Please i have a lot of this messages, exist here any possibilities to ban
> this ip or host, so this will try every view min.
>
>
>
> Oct 16 12:33:59 mail postfix/smtpd[23436]: warning: hostname walkerj235.com
> does not resolve to address 91.200.12.56
>
> Oct 16 12:34:03 mail postfix/smtpd[23436]: warning: unknown[91.200.12.56]:
> SASL LOGIN authentication failed: ZuFzc3waA31Zb
>
> Oct 16 12:38:06 mail postfix/smtpd[20167]: warning: hostname walkerj235.com
> does not resolve to address 91.200.12.56
>
[...]
Have you tried fail2ban?
