![]() This approach could be adapted for imap and pop :SMTP_Check_Auth_OUTPUT. The format is the CentOS/Redhat /etc/sysconfig/iptables or iptables-save. This is an abbreviated sample, the full script is at. Our mail server is under a constant dictionary attack from a number of sources and this has rate limited that from 10 per minute to one every 5 minutes or do. With that you can look for authentication errors and add them to a ban list. Iptables has the ability to inspect the contents of a packet. Server: Debian GNU/Linux 7.5 x86_64 / Direct Admin / CSF Firewall So I have decided to block all ip addresses accessing port 25, 465, 587 by putting this in the /etc/csf/csf.deny tcp:in:d=25:s=0.0.0.0/0Īnd i allowed my ip addresses in the /etc/csf/csf.allowĬan still outside world email me? Port 25 is blocked? tcp:in:d=25:s=124.12.0.0/20 It is not a commercial hosting so only 4-5 different ip addresses actually logs into the email clients to check emails. The messages are something like Feb 27 04:31:15 host1 dovecot: pop3-login: Aborted login (auth failed, 1 attempts in 2 secs): user=, method=PLAIN, rip=194.63.XXX.XXX, lip=XX.XX.99.210, session=įeb 27 04:31:05 host1 exim: exim: Aborted login (auth failed, 10 attempts in 20 secs): user=, method=PLAIN, rip=194.63.XXX.XXX, lip=XX.XX.99.210, session= I get constant brute force attacks warnings in directadmin from IPs in Russia & China etc etc. I am facing an issue and need your expert advice. ![]()
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