To limit repeating offenders, you might like to try playing with smtpd_client_connection_count_limit, smtpd_client_connection_rate_limit, and anvil_rate_time_unit
For my quiet (domestic) server, I have set limits of two simultaneous connections, and twelve connections per hour. If a remote host exceeds either of these limits, the connection request is refused. Ironically, the refusal often generates more log entries than the actual offence, but it is an extra hurdle for the "baddies" to circumvent. Alternatively, if it is only one host doing this, you could add "91.200.12.56 REJECT" into your hosts access-control file. Allen C On 16/10/17 12:32, Maurizio Caloro 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 > > Oct 16 12:38:08 mail postfix/smtpd[20167]: warning: unknown[91.200.12.56]: > SASL LOGIN authentication failed: ZuFzc3waA31Zb > > Oct 16 12:42:16 mail postfix/smtpd[27854]: warning: hostname walkerj235.com > does not resolve to address 91.200.12.56 > > Oct 16 12:42:20 mail postfix/smtpd[27854]: warning: unknown[91.200.12.56]: > SASL LOGIN authentication failed: ZuFzc3waA31Zb > > Oct 16 12:44:12 mail postfix/smtpd[11374]: warning: unknown[80.82.77.153]: > SASL LOGIN authentication failed: ZuFzc3waA31Zb > > Oct 16 12:46:28 mail postfix/smtpd[30250]: warning: hostname walkerj235.com > does not resolve to address 91.200.12.56 > > Oct 16 12:46:31 mail postfix/smtpd[30250]: warning: unknown[91.200.12.56]: > SASL LOGIN authentication failed: ZuFzc3waA31Zb > > Oct 16 12:47:46 mail postfix/smtpd[30250]: warning: unknown[191.96.249.214]: > SASL LOGIN authentication failed: ZuFzc3waA31Zb > > Oct 16 12:50:46 mail postfix/smtpd[1148]: warning: hostname walkerj235.com > does not resolve to address 91.200.12.56 > > > > Thanks for any help > > Reards > > Mauri > >
