se ti interessa solo rimuovere l'ip puoi fare una cosa del genere
Codice: Seleziona tutto
crap0101@orange:/tmp/FOO$ cat m.txt
blablabla
X-Originating-IP: [209.85.22.122]
Authentication-Results: mta1139.mail.ir2.yahoo.com from=gmail.com; domainkeys=neutral (no sig); from=gmail.com; dkim=pass (ok)
Received: from 127.0.0.1 (EHLO mail-wi0-f178.google.com) (209.85.212.178)
by mta1139.mail.ir2.yahoo.com with SMTPS; Mon, 08 Jun 2015 15:36:52 +0000
blablabla
crap0101@orange:/tmp/FOO$ sed -r 's/(^X-Originating-IP: \[)[.0-9]+(\].*$)/\10.0.0.0\2/' m.txt
blablabla
X-Originating-IP: [0.0.0.0]
Authentication-Results: mta1139.mail.ir2.yahoo.com from=gmail.com; domainkeys=neutral (no sig); from=gmail.com; dkim=pass (ok)
Received: from 127.0.0.1 (EHLO mail-wi0-f178.google.com) (209.85.212.178)
by mta1139.mail.ir2.yahoo.com with SMTPS; Mon, 08 Jun 2015 15:36:52 +0000
blablabla
se invece vuoi eliminare proprio tutto il campo, imho meglio scrivere qualche riga in perl o python utilizzando uno dei loro moduli per parsare le email.