Horas and konnichiwa untuk semua

Let’s say the junk mails to deleted from qmail queue contains “
From: MAILER-DAEMON@ns.maltech.ne.jp”, then this will delete them all
(first move to /var/qmail/alias/Maildir/new):

find . -exec grep -q “From: MAILER-DAEMON@ns.maltech.ne.jp” ‘{}’ \; -print | awk ‘{ print “rm -fr ” $1 }’
| sh

Btw, to delete files with certain extension, do like this:
find public_html/ -name *.png -exec rm ‘{}’ \;