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<p>Jim,</p>
<p>Ideally, your MTA (Postfix, Sendmail, etc.) should reject mail to
non-existent accounts during the initial SMTP transaction, before
MailScanner ever sees it. See page 8 of the MailScanner guide book
for an overview of how it works, available here:<br>
<a class="moz-txt-link-freetext" href="https://s3.amazonaws.com/mailscanner/docs/ms-admin-guide.pdf">https://s3.amazonaws.com/mailscanner/docs/ms-admin-guide.pdf</a><br>
</p>
<p>If you provide more details on your server configuration, someone
here may be able to point you in the right direction. For example,
with Postfix, see:<br>
<a class="moz-txt-link-freetext" href="http://www.postfix.org/SMTPD_ACCESS_README.html">http://www.postfix.org/SMTPD_ACCESS_README.html</a><br>
<blockquote type="cite">Rejecting mail for a non-existent
recipient address. This
form of ingress filtering helps to keep the mail queue free of
undeliverable MAILER-DAEMON messages. This requirement is
enabled
by default ("<a
href="http://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_recipient">smtpd_reject_unlisted_recipient</a>
= yes").</blockquote>
</p>
<p>If you are relaying for other mail servers, you may also want to
enable recipient address verification:<br>
<a class="moz-txt-link-freetext" href="http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient">http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient</a></p>
<p>Alan<br>
</p>
<div class="moz-cite-prefix">On 5/6/2016 9:45 AM, Jim Wirtz wrote:<br>
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<p class="MsoNormal">Is there a way to configure MailScanner to
not process email to nonexistent users/accounts?<o:p></o:p></p>
<p class="MsoNormal">My server spends a lot of CPU time to
check/process emails that are just going to be deleted.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks....<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Jim<br>
</p>
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