You can actually export the Rules, which has the "Blacklist email address’s in the exported “Settings.xml” file. Then copy the list of email address’s from the .xml file to whatever you want.
(Example eM Client V9.x Extract Settings.xml Rules only file)
<name>Blacklist</name>
<active>true</active>
<invocation>OnReceive</invocation>
<scope>AllAccounts</scope>
<type>Blacklist</type>
<account />
<composeXml><?xml version="1.0" encoding="utf-16"?>
<UIRule xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xmlns:xsd=“http://www.w3.org/2001/XMLSchema”>
<dataEntered>false</dataEntered>
<name />
<active>true</active>
<invocation>OnReceive</invocation>
<wordsInSubject>false</wordsInSubject>
<fromPeople>true</fromPeople>
<fromPeopleData>
<string>[email protected]</string>
<string>@aworov.com</string>
<string>@banesch.com</string>
<string>[email protected]</string>
<string>[email protected]</string>
<string>@carcopts.com</string>
<string>@cellazo.com</string>
<string>@ciangas.com</string>
<string>[email protected]</string>
<string>@difitee.com</string>
<string>@ecyclin.com</string>
<string>@entamp.com</string>
<string>@kentodt.info</string>
<string>@lesclass.com</string>
<string>@lesphedu.com</string>
<string>[email protected]</string>
<string>@matisist.com</string>
<string>@microtg.com</string>
<string>@midinve.com</string>
<string>[email protected]</string>
<string>[email protected]</string>
<string>@sheplamb.com</string>
<string>@straxer.com</string>
<string>@sustoma.com</string>
<string>@twatos.com</string>
<string>@welousis.com</string>
<string>@wraur.com</string>
<string>[email protected]</string>
<string>[email protected]</string>
<string>[email protected]</string>