>>> DATA
<<< 550-Message rejected because (linux11322.dn.net) [161.58.178.253]:57443 is
<<< 550 blacklisted at dnsbl.njabl.org see
550 5.1.1 <
[email protected]>... User unknown
<<< 503 valid RCPT command must precede DATA
damn... and no, I don't spam!