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PHP: 7.2.24-0ubuntu0.18.04.17
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File: //usr/share/webmin/sendmail/help/opt_RefuseLA.html
<header>Max load average for receiving</header>

Determines the load average beyond which sendmail no longer accepts
incoming messages via SMTP, forcing other mail servers to queue them for
later delivery.  This option is useful
for preventing heavy mail traffic from overloading your system.
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