Its hard to know exactly what is going wrong, but here is a common problem: are you using an email service which synchronizes your local inbox with a remote server? Microsoft Exchange does this, as do generic IMAP mail servers. So even though the file gets removed locally, its still in your remote inbox (and gets copied back by your email client program). You need to find the email message containing this attachment and use your email client to delete it. That will delete it from the remote server as well as the local copy.
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