| Server IP : 81.2.241.106 / Your IP : 216.73.216.165 Web Server : Apache/2.4.67 (Debian) System : Linux tranq-f.bakta.org 5.10.0-45-amd64 #1 SMP Debian 5.10.259-1 (2026-07-02) x86_64 User : lisky ( 1002) PHP Version : 7.4.33 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : OFF | Sudo : ON | Pkexec : OFF Directory : /etc/fail2ban/filter.d/ |
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# Fail2Ban filter for sendmail authentication failures
#
[INCLUDES]
before = common.conf
[Definition]
_daemon = (?:sendmail|sm-(?:mta|acceptingconnections))
# "\w{14,20}" will give support for IDs from 14 up to 20 characters long
__prefix_line = %(known/__prefix_line)s(?:\w{14,20}: )?
addr = (?:IPv6:<IP6>|<IP4>)
prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$
failregex = ^(\S+ )?\[%(addr)s\]( \(may be forged\))?: possible SMTP attack: command=AUTH, count=\d+$
^AUTH failure \(LOGIN\):(?: [^:]+:)? authentication failure: checkpass failed, user=<F-USER>(?:\S+|.*?)</F-USER>, relay=(?:\S+ )?\[%(addr)s\](?: \(may be forged\))?$
ignoreregex =
journalmatch = _SYSTEMD_UNIT=sendmail.service
# DEV Notes:
#
# Author: Daniel Black