Perform check for error code 2303, Domain does not exist.
when a request for domain info is performed on a domain that does not exist the result code is 2303. example of one such response is:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<epp:epp xmlns:epp="urn:ietf:params:xml:ns:epp-1.0">
<epp:response>
<epp:result code="2303">
<epp:msg>Domain does not exist</epp:msg>
</epp:result>
<epp:msgQ count="59" id="OTE-EPP-1450AE4ED95-99648"/>
<epp:trID>
<epp:svTRID>OTE-EPP-145BCA07E65-6D3AA</epp:svTRID>
</epp:trID>
</epp:response>
</epp:epp>