View source for King0770-Notes-Rejecting-Nested-From-Addresses

This is a how-to reject nested from addresses.<br>

Example<br>
<code><pre>
From:<rick@zimbra.comjohn@zimbra.com>

OR

From:<"rick@zimbra.com john"@zimbra.com>"

From:"<"rick@zimbra.com.johm"@zimbra.com>"
</pre></code>

Add the following to the top of the /opt/zimbra/conf/zmconfigd/smtpd_sender_restrictions.cf file<br>
<code><pre>
check_sender_access pcre:/opt/zimbra/conf/sender_pcre
</pre></code>

Next, create the /opt/zimbra/conf/sender_pcre file with the following.<br>
<code><pre>
/@.*@/       reject
</pre></code>

Restart MTA
<code><pre>
zmmtactl restart
</pre></code>

Check it. 
<code><pre>
postconf | grep ^smtpd_sender_restrictions

You should see something similar to to this...

smtpd_sender_restrictions = reject_authenticated_sender_login_mismatch, check_sender_access regexp:/opt/zimbra/common/conf/tag_as_originating.re, permit_mynetworks, permit_sasl_authenticated, permit_tls_clientcerts, check_sender_access regexp:/opt/zimbra/common/conf/tag_as_foreign.re, check_sender_access pcre:/opt/zimbra/conf/sender_pcre
</pre></code>