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Server: Apache/2.4.29 (Ubuntu)
System: Linux bareserver 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023 x86_64
User: root (0)
PHP: 7.2.24-0ubuntu0.18.04.17
Disabled: 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,
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File: //usr/share/webmin/postfix/help/smtpd_restrictions.html
<ul>
<li><tt>reject_unknown_client:</tt> reject the request if the client hostname is unknown.
<li><tt>permit_mynetworks:</tt> permit if the client address matches
        <a href=opt_mynetworks><tt>$mynetworks</tt></a>.
<li><tt>check_client_access maptype:mapname:</tt> look up client name,
	parent domains, client address, or networks obtained by stripping
	octets.  Reject if result is REJECT or &quot;[45]xx text&quot;. 
	Permit otherwise.
<li><tt>reject_maps_rbl:</tt> reject if the client is listed under
        <a href=opt_maps_rbl_domains><tt>$maps_rbl_domains</tt></a>.
<li><tt>reject:</tt> reject the request. Place this at the end of a restriction.
<li><tt>permit:</tt> permit the request. Place this at the end of a restriction.
</ul>