Hello, my friend

I have install the fail2ban few days before

and set the file /etc/fail2ban/jail.conf
        [sasl-iptables]
        enabled  = true
        filter   = sasl
        backend  = polling
        action   = iptables[name=sasl, port=smtp, protocol=tcp]
                   sendmail-whois[name=sasl, dest=tom@yi-enter.com]
        logpath  = /var/log/maillog
        maxretry = 5

/etc/fail2ban/filter.d/sasl.conf
        failregex = (?i): warning: [-._\w]+\[<HOST>\]: SASL (?:LOGIN|PLAIN|(?:CRAM|DIGEST)-MD5) authentication failed: \w

run the failban proogram when the server start
today, I got so many maillog about sasl authentication failed
It means fail2ban do not work at that time

/var/log/maillog
        Oct  9 09:50:06 shcx postfix/smtpd[19614]: warning: SASL authentication failure: All-whitespace username.
        Oct  9 09:50:06 shcx postfix/smtpd[19614]: warning: mail.vassallobilotta.com[74.223.197.162]: SASL LOGIN authentication failed: generic failure
        Oct  9 09:50:09 shcx postfix/smtpd[19614]: warning: SASL authentication failure: All-whitespace username.
        Oct  9 09:50:09 shcx postfix/smtpd[19614]: warning: mail.vassallobilotta.com[74.223.197.162]: SASL LOGIN authentication failed: generic failure
        ........hundreds of log just like that
        Oct  9 13:12:12 shcx postfix/smtpd[19899]: warning: mail.vassallobilotta.com[74.223.197.162]: SASL LOGIN authentication failed: authentication failure

Maybe I set something wrong, can you help me
Thanks for your time

TOM